Are there any signs indicating a weight restriction on the bridge where Cambridge Heath Road crosses the Regent's Canal?

This may be a weak bridge sign (maxweighrating) or goods vehicle (maxweightrating:hgv).

osm.org/way/4984515

Is Hannaford Walk actually signed as a "Home Zone", or is it just a street within a private residential development?

osm.org/way/313596280

What is the name of this road?

It is in OS Open Roads as Essex Road, but has a different Designated Street Name USRN. The crescent is also Grade II Listed as Annette Crescent.

osm.org/way/23359571
https://historicengland.org.uk/listing/the-list/list-entry/1025278

Are there any signs to indicate an HGV weight restriction or 20 mph zone on Bentley Road at its junction with Kingsland Road?

osm.org/way/1410891868

Unable to answer "What kind of memorial is this?" – Lancing War Memorial (Shelter) – osm.org/way/493006054 via StreetComplete_ee 57.0:

It's a bandstand, not a war memorial.

Attached photo(s):
https://westnordost.de/p/205309.jpg
https://westnordost.de/p/205310.jpg

There is currently a maxweight=10 tag on Hambridge Road, which is likely to be incorrect.

Is there a signed weight limit on the bridge (should be tagged with maxweightrating=*), or an HGV weight limit (maxweightrating:hgv=*) elsewhere? If so, this

osm.org/way/164209294

What is the maximum height on Brick Lane under the Windrush Line railway bridge? #surveyme