I received a reply to this as a private message, for changeset discussions it is better to keep these discussion public where they can be seen by all mappers.

The whole is known as Swarkestone Bridge by most people, but most don't consider the detail in the way that a mapper does. The actual bridge is the section that crosses The Trent.
The section that was previously tagged as Swarkestone Causeway is its name (the name tag is not for adding detail or descriptions). There is a large brown sign at the southern end with that name on it.
A bit out of focus but I have been that way many many times https://www.mapillary.com/app/?lat=52.843430900000016&lng=-1.4485190999999986&z=17&pKey=pq4fRH6dOQhWDZ0jz6ujow&focus=photo&x=0.5604635003420566&y=0.5296476193112039&zoom=1.2231030577576445

As Mike says there are bridges within the structure, but these are very short and maybe a case for added detail but it the whole section is certainly not a bridge, as you can seen when you walk the rights of way beside it. It is mostly solid.
Cheers Phil

Hi, what is your reason and source for this change? Have you been there?
The section you have tagged as a bridge is very definitely a causeway, and it is called simply Swarkestone Causeway.
I will see what other local mappers view is, but mine is that this should be reverted.
Cheers Phil

The biergarten tag is a little out of place. I suspect it is a pub beer garden.
amenity=biergarten?uselang=en

I am reverting these edits, they are very definitely recreation grounds

Hi, welcome to OSM. The Guards Museum is already mapped. I am removing this duplication

I have put the buildings back, less pub and health centre tags

Thank you for your relply, I will revert this change to put the buildings back and then correct the tagging.

Hi, welcome to OSM. Is this a verifable office with signs I would see if I walked down Adelphi Road?

Hi, welcome to OSM.
I am always a bit concerned when a new mappers first edit is to just delete things.
You have not explained what was wrong with the Health Centre but the building seems to match what is on bing imagery so maybe the tags should be changed but deleting the building is not the way to change things. Also you say that the pub has closed, if so remove the pub tags but has the building been demolished?
I would suggest this change be reverted and changes made correctly.

Hi, SOFA should be mapped as shop=charity, charity=furniture. You will need to use a proper editor such as iD to change it though. Give me a shout if you need a hand.

Stirling Castle is already mapped in great detail, a node doesn't add anything so I am reverting this edit.

Hi, welcome to OSM. I am not sure a community centre is really the way to describe a yacht club. Plus it is already mapped as.a marina.

Hi, thank you for adding the car park however you have made a common beginners mistake by putting a description in the name field. If the car park doesn't have a name, then leave the name field blank.
Cheers Phil

There are more changes here than your stated incorrect layer.
You have also changed oneway=-1 to oneway=yes on way/204098940 thus reversing the direction of travel for that section

Hi, please can you point me to where this mechanical edit was discussed?
You seem to have mechanically armchaired layer=1 onto bridges with no survey, if you had you would have seen that the bridge should be at layer=0 and maybe whatever is below them needs a later=-1 where it is below ground level.
Many are plank footbridges that are mapped for PROW completeness and are certainly not above ground.
Each of these cases needs an actual survey, it cannot be determined from an armchair.
For example https://www.mapillary.com/app/?lat=52.851990150000006&lng=-2.72679801000001&z=17&pKey=nEq-hE5PAqA4be5EM62PkQ&focus=photo is certainly at 'ground' level.
Also some were just mistagged in the first place, such as way/91002981/history. Rather than fix the problem you have just added an extra tag.

Its a recreation ground, reverted

Reverted, not a park

It is in a park, but this is a football pitch. Reverted

Hi, please could you add some more detail to the artworks. A pub car park is an odd place for an artwork.
Thanks Phil

Hi, way/188281048 does not need to be mapped as a tunnel. The road is already mapped as a bridge.