Greyhound Rescue Centre. Wimbledon Greyhound Welfare.
http://www.hershamhounds.org.uk
This rescue centre is actually in Hersham not Wimbledon but derives its name from the Wimbledon Dog Track not too far away. Rescue is maybe the wrong word. These greyhounds finish their racing life maybe aged 5 years and are mostly less than ideally or maybe not at all socialised. This centre works with them to train them and then home them. Each day anyone can go along and walk a greyhound. contrary to popular opinion then need quite short often gentle walks of maybe 20-30 minutes only and are kind docile dogs. the centre is an independent charity.
Whereas some dogs can be homed relatively quickly for others it may never be possible or take 3-4 years.
Burhill Kennels, Turners Lane, Hersham, Surrey. KT12 4AW. Tel: 01932 224 918
Opening Times are from 11am to 2pm each day
chris1957
Arcticterntalk.org 
Just saw a prog on puppy breeding when owners were told by officials that the dogs must have heated kennels in the winter. Do,you have some heat for the greyhounds, as especially they have such thin coats and they are held in cubicles as I recall with some straw.
I have no idea. You would have to ask the greyhound centre directly I guess