For your consideration a cherry red rose from one of Englands premier hybridizers Jack Harkness: 'Lady Mitchell'. Lady Mitchell has glossy, very disease resistant foliage, a nice rounded short bush shape coupled with 5 inch fragrant multi-petaled blooms. She makes a good candidate for a container.

Here is a link that might be useful: {{gwi:303227}}

I just got back from the Dulverton area, and also visited Salisbury. Lovely country. All the roses I saw were healthy, and of course with the rain lately, its hard to imagine the sun fading anything in England. Red roses have some great scent, so I would consider one like Chrysler Imperial, or if you like a larger tea type, Veterans Honor is another. Both grew well in Columbia, SC in a full sun garden. While CI can get some fading, it never seemed to be a problem with VH.

I think you would do well with a floribunda called Glad Tidings. It is a very sturdy red that seems to do reasonably well in a variety of climates. It has a controlled growth habit so that it won't get out of bounds for a container. It blooms well, and the flowers are quite velvety. It has survived in my yard. That is a big plus given the conditions.