Pedal Power cycling club (for people with Learning Disabilities and Physical Disabilities) up at the race track in Finsbury Park are always in need of bikes.
Thanks. Have contacted...
You could also try contacting Haringey Migrant Support Centre http://haringeymsc.org/contact-us/.
… who may be able to direct you further. Also, have you considered providing/fundraising for locks also?
The Bike Project https://thebikeproject.co.uk/ is a brilliant charity which provides cycles and training/support for refugees - always looking for donated bikes.