Ok so no shortages of recomendations then!
Its nice to see so many recomendations that I have already read!
I worked my way through the 'chronicals of amber' as one great tome it was hard work and between the books often confusing but really rewarding. I would certainly recomend them again.
I recently got my hands on 'ringworld' and 'engineers' and am now certain why they are considered classics.
Im currently reading 'left hand of darkness' which like the 'disspossesed' is blowing my mind and certainly contributed to why I was late for work this morning!
Im now going to keep an eye out for 'Stand on zanzibar' as I read the sheep look up over the summer and loved it. On a similar vein il look out for 'the golden globe' having read steel beach a while ago.
As a piece of general advice for anyone wishing to do this I can thouroughly recomend Oxfam bookshops. My local one has a respectable selection of scifi at good prices and an in house expert in once a week. I was appalled to see teenage vampires have now moved into the section but I wont hold this against them.
Thanks to all who have contributed and please continue!