Hello and welcome to OpenStreetMap.
May I explain that OSM is a database from which all sorts of maps, for all over the world, for everyone, for free, are compiled. As such anything added to the database that is not compatible to the database standards could be extremely disruptive.
Your addition of an area tagged as water not only covers an area of the Thames but also a large area of the city. Map makers would show your area as flooded from Charing Cross to Waterloo. I have therefore reverted your changset upload, effectively deleting the new area from the database. I hope you can agree to this deletion, however if I am wrong I apologise and the area can be re-flooded.
Regards

Hello and Welcome to OpenStreetMap.
I notice that the two hotels you have added are not named and are in very close proximity to two named hotels. If you are mapping The Westbury Hotel and The Washington Hotel then your new POI are duplication's and should be removed.
If your new POI are indeed independent of the adjacent hotels then it would be helpful to name them.

Hello and Welcome to OpenStreetMap.
I've looked at your first mapping and would like to make a few comments.
You added (inadvertently?) two nodes without description tags (4353676095 and 4353676094), these should be appropriately tagged or if unintentional should be removed.
You added (inadvertently?) ways 437557067 and 437557068 which have no tags and should either be tagged or removed as appropriate.
You added a closed linear way "Norwich International Airport (437557069)" as the airport boundary. The airport boundary is already mapped and fully described in the "Multipolygon Relation: Norwich International Airport (535525)". Therefore, as the new way/outline is a duplication of the data and the boundary, it can be removed. Any adjustments or amendments of data, plus any changes in the boundary outline should be made on the multipolygon.
This is a link to the multipolygon :- relation/535525
Sorry to find problems with your first additions to OSM. If I or the OSM community be of any help please just ask. Regards.

Hello and Welcome to OpenStreetMap.
I have reversed the name change on the bus stop because that name is given by the bus company it is not the actual pub name. Bus company name is "The Gate, adj" meaning that the stop is adjacent to a local feature and not the feature itself.
I have also adjusted the guest house tagging to better suit OSM practices and added the website. Regards.

Hi, the building you've added facing Halliford Street is not a single building but 5 buildings, they look like semi detached houses.

Hi and welcome to OpenStreetMap.
I think you may have mapped the surgery on the wrong building.
This building is number 2, the surgery is located at number 2A to the south (see here :- http://www.nhs.uk/Services/GP/Overview/DefaultView.aspx?id=38944) Click this link to see a picture of the correct building :- http://latymerroadsurgery.co.uk/
Regards

Hello, Ridge Road looks at lot wider than 7 feet, in fact it looks like it is an extra wide road. It is therefore not correct to tag it as maxwidth=7'0" This is obviously not the case especially as you intimate that it has been tagged thus to discourage traffic.
A better way is to map exactly what is on the ground. The road is restricted at the Church Street end and is separated into two narrow lanes (possibly each 7 feet wide), with an emergency lane between them. Regards

I think you've got this cafe in the wrong place, it is already mapped under the parent company name of Benugo at 33 Commercial Road. Your POI should therefore be removed.

But apparently the restaurant is now under new ownership and a new name.

Hi and Welcome to OpenStreetMap.

The website you posted for the restaurant is no valid so I have removed it.

Hello and Welcome to OpenStreetMap.
That's a block of apartments not just one. So the block address is for all apartments.

Hello and Welcome to OpenStreetMap.
OSM is primarily a database rather than a map, information added to the database is then used by anyone to produce maps. We should not add data to influence map rendering. (to make it show up as we would like).

I have removed your Tate POI as it is a duplication of the data contained on the building outline, therefore adding little to the database. I have included/added to the building the opening times, phone number and website that you supplied Many Thanks

Hello and welcome to OpenStreetMap.
OSM is a database rather than just a map. To go with OSM best practice I have made a few adjustments to the POI taxi service you added to the database :-
adjust postcode, capitalize leading letters to road name, changed it to taxi (as per website), changed name (as per website) and adjust phone number. I deduced the property this operation is run from, mapped that house and placed the information on that building. Now the map can properly show the building and address the service is run from.

Hello and welcome to OpenStreetMap.
It is usual in English to write postcode, street and name with the initial letters as capitols so rather than :-
addr:postcode=nw1 0aa
addr:street=bayham street
name=smart camden inn hostel
You would have :-
addr:postcode=NW1 0AA
addr:street=Bayham Street
name=Smart Camden Inn Hostel
Also please note you have positioned the POI on Charlton Street. Also that there is already a hostel named "Camden Inn" on Bayham Street. Would you please rectify the anomaly.

Hi, I think you've got some of your kerb's area outlines the wrong way round, please see here as to the direction of the outline way for where the top of the kerb is :- barrier=kerb

Hi, for your information the building was already associated with the street and is also associated (via the street association) with the place Walton-on-the-Naze. Your addition therefore does not add anything to the database except to bloat it a tiny bit.

Also you now have two highways along here. Neither of which join to the end of what is named Hall Road. My information shows this section also to be named Hall Road which continues to the cattle grid to the east.

Removed the name=Private from two car parks. They may be private but there is no suggestion that they are officially or otherwise named "Private". Also added access=private tags.

Hi, this node is where the footway (Rupert Court) joins with the street (Rupert Street). There in no restaurant in the middle of the street so I will remove it.
If you know where the restaurant is sited please add the POI at that position.

Hi, your POI has been added to the live worldwide OpenStreetMap database. Unfortunately the information is incorrect.
Westminster should have a capitol letter W. The park is actually Buckingham Palace Garden and is already mapped as such. (Did the Queen know you were there.) If you mistakenly placed this POI in the wrong position please be advised that Hyde Park is already mapped.
I will now revert your mapping so you have to do nothing else to correct this problem.