Suggest local things or hidden gem Things To Do in LONDON?

[Withlovemegan]

I used to live in London for many years and will be visiting for the day tomorrow.
I’ve explored London a lot over the years.

Can you suggest non touristy off the beaten path places to visit that I may not have already seen?

I like discovering high streets I haven’t been to before, or pretty neighbourhoods to stroll around that may have buzzy things going on or lovely little cafes or markets to have a nibble in.

I’ll be arriving early in the morning and leaving early evening. Thanks Mumsnet

Hampstead, have a wander round the high st and Heath st,(chi chi shopping, independent shops), see if you can visit NT property 2 Willow Rd, home of modernist architect Erno Goldfinger (essential background research for The Brutalist!) - but it might not be open yet. Visit Kenwood House - English Heritage but entry is free (you can book a slot) , have a wander on Hampstead Heath for great views