[Elixer]

I know someone whose extended family have a few allotment in your area.
Not sure how close you are, but Brent council has two allotment sites that has plots available now;

Cecil Avenue, Wembley, HA9 7DY
Woodfield Avenue, North Wembley, HA0 3TP
Gibbons Road, Neasden, NW10 9BR
Lyon Park Avenue, Wembley, HA0 4DZ

Allotment rent is £41.75 for Brent residents and £46.75 for non-Brent residents for 62m2 (2.5 poles) per year.
You can get 50 per cent off the annual rent of a plot of up to 5 poles, if you are a Brent Resident and:
over 60
receive unemployment benefits
receive disability benefits.

More info and all about the allotments here;
https://www.brent.gov.uk/services-for-residents/sport-leisure-and-parks/allotments/about-our-allotments/

That was great I can use all that. My council is Brent.

[Elixer]

Well done everyone !

Job done 

Thank you for realising I was making a big mistake I typed 'allotment for sale uk' and I get something else! Thank you again Auntie. You were cool.