On Fri, 07 Nov 2008 17:01:29 +0000, Andy Kirkland
wrote:

Thanks everyone for the info - will go for a 27" or 36" one.

Now to the task of removing the old one..... penetrating oil, wait, more
oil, wait, tap gently, more oil, wait, attach spanner, pray!

Cheers

Andy

Hope you'll be pleasantly surprised .Mine unscrewed quite easily
altho' it had been in years