I've got the C&T price list.
Pela 6.5 £59.95, Pela 6 £34.95, Pela 4 £49.95. From the blurb the 6 is the spherical one and the 4 is an upright one. It doesn't say what the 6.5 is. I've also been sent a 10% discount voucher off all orders made before 31st Dec, and redeemable at the Boat Show.
Marine Super Store (sic) at Port Solent have a brass cylinder type jobbie on the shelves. Can't remember the price, but I do remember thinking it wasn't expensive compared with others.
I've just purchased the cheaper Pela and contrary to many of the other posts found it worked purfectly, if a little slow.
It's very important to get the oil warm before you start, the cleanest oil change I have ever done!!