No, they aren't commonly grown and you don't have to go to the UK to get seeds per your link. Did you?(smile)

Best to search for them using hypertress tomatoes, and I've given a link below to a Googl esearch and here's another one from Tania;

http://t.tatianastomatobase.com:88/wiki/Red_Centiflor#tab=General_Info

Note that there are several places in the US where you can get seeds for them and the UK place I think cites Alan Kapuler as well.

Hope that helps,

Carolyn

Here is a link that might be useful: Centiflors