The short road south of A1057 Hatfield Road (linked to St Yon Court and Gresford Close) and the junction of Colney Heath Lane and Hill End Lane is actually Colney Heath Lane, as per the street name signs.

Unable to answer "What’s the height limit here?" for way/692267100 via StreetComplete 51.1:

Sign half cut off

Attached photo(s):
https://westnordost.de/p/135806.jpg

Also a junior school?

https://get-information-schools.service.gov.uk/Establishments/Establishment/Details/117258

there should be a public footpath going north east from here but it may travel through a farm yard

The exact route of this public footpath needs to be confirmed

Robin Hood

Unable to answer "What type of shop is this?" for way/1043585805 via StreetComplete 51.0:

Mix of businesses

Where does Barnfield Rd transition to Meadow Walk?
The current mapping looks unlikely. House number survey?

The area bounded by the River Lea, Marquis Lane, and the Harpenden/Wheathampsted boundary is now a part of the adjacent Batford Springs Local Nature Reserve

solar