Hello DancingFlame
As in the South East, I am sure there are places, groups, including spiritualist churches in Cardiff as well.
There is one in Andover, but I know it is a long trek for you. How about Bristol?
Here is a link for you that gave all the results in Cardiff.
Good luck and let me know if you need any further help.
http://www.google.co.uk/search?q=spirit ... =firefox-a