[chickpeacurry]

Put a grape vine in the greenhouse which I bought from the B and Q in the song year sale.   It had plenty of leaves but no grapes.  The leaves are starting to brown.   Should I just cut it back or leave it to die back itself. 

[Trillium]

Leave the vine to die back on its own or it could 'bleed' now and be killed by frosts or very cold weather. Grape pruning is always done in spring once you see new growth buds start to appear.

It might take a few years for grapes to form. All depends on your soil, immediate climate, and variety. But you should see a few grapes soon.