Ah, okay - many thanks (yet again) to you and everyone else for your help. I'll see what I can get in terms of a new high pressure valve, spare washers and a 6" copper float. Fingers crossed.
Got to say a big thank you to everyone for the help and advice given.
Cheers and beers!
Thanks, but I don't know what that means.
I found these online:
http://www.screwfix.com/prods/11518/Plumbing/Toilet-Fittings/Float-Valve-Part-2-?cm_mmc=NexTag-_-Plumbing-_-Toilet%20Fittings-_-Float%20Valve%20Part%202%20%22&source=aw#...