Once again thanks Ma for your reply. I have now removed the top of the tap and thoroughly cleaned it removing all lime scale from the metal and the large 'O' ring made of a hard plastic.
There is a complex shaped rubber seal in the centre of the tap over the various orifices, this seems to be in perfect condition.
However when I reassembled water still leaked out from the seat where the hard plastic ring goes. I tried wrapping the threads with ptfe tape but it still weeps. I don't see any other washers that I can replace. Where online can one find replacement washers for the ones I have as I don't know what they are called.
Thanks,
Ben
Ben
March 2009