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Thanks everyone for all the lovely replies and pics.
To Dollychris's question, I've just been doing some checking. The oldest living cat is Mischief, aged 27, (125yrs in human terms), he lives in St. Austell, Cornwall. He's a gorgeous black & white (felix type) cat. If you google 'World's Oldest Cat Celebrates 125th Birthday', there's a lovely photo of Mischief.
At present there is no Guinness Book of Records holder, since Spike a ginger tom, (who held the UK record of oldest cat), died aged 29 in 2001. Hope Mischief makes it into the Records, he's really lovely.
The oldest cat ever in Guinness Book of Records was Cream Puff, of Texas, (what a lovely name), she was born on 3rd August 1967 and died on 6th August 2005, aged 38 years, 166 in human terms. Amazing.
So it looks as if Tansy has a way to go yet. I wonder if she'll catch up to Mischief.
By the way, Mischief looks just like my Felix, but Felix is only 6yrs.
Thanks again everyone, for making Tansy's and my day very special. Schutz.