Raspberries you need to try and work out if they are summer or autum rasps...autumn ones will be fruiting heavily now and will continue to fruit until first frosts.
If they are autumn variety then you cut down all the canes each winter once they've died back. If they are sumer ones then as ccat says.
Even if they are summer ones i would recommend gettting some autumn ones as is lovely to still have soft fruit this time of year when all the strawbs etc are done. We have the variety Autumn Bliss and they are lovely!
You can also plant some lettuce now and quick stuff like radish should eb ok especially if the weather stays nice for a few weeks.
If you can get some leek seedlings from anywhere they would be worth planting. Also agree with sprouts. purple sprouting if you can get some plants (rather than seeds) to start you off.
Exciting stuff...i love my allotment.
This book is fab...
Vegetable and Herb Expert by D.G. Hessayon
He also does a fruit one...often sold in garden centres.
They're good as tell you the practical basics like plant potatoes this deep, this far apart etc...fairly idiot proof (ie works for me!)