Someone asked recently in the facebook group where the local blackberry bushes are, but i think its useful information for everyone to be able to google 
- answers were (anonymised)
- Drew Lane
- Lakeside
- Fleming Park up by where old golf course was
- Knowle park in fair oak
- Stoke park woods
- Next to Crestwood school all the way up the path to Broadlands rd.
- Fair Oak on the fruitbush Estate
- Junction 5 on m27 outside lane by bridge
- Top of nightingale
- Shakespeare by the turning to Boyatt Wood shops.
Hit reply and let us know if you know of more places!
Happy blackberry picking!