Divine service at a spiritualist church always includes a demonstration of mediumship. This is so that there can be proof of survival of the spirit or soul, after bodily death. This is the basis of spiritualist teachings.
The medium gives philosophy, says prayers and then demonstrates the gift of mediumship. This being interspersed with hymns and readings.
Whenever there is a different type of mediumship being demonstrated it is classified as experimental mediumship. This is not allowed at divine services. Flower reading, ribbon reading and trance mediumship are classed as experimental. So are automatic writing, aurography and psychometry.
Table tilting is also considered experimental. Psychic suppers, where a medium sits with a group to give short readings, prior to having supper, is also experimental.
Of course, since the law was changed and the old fraudulent mediums act was repealed, most of what occurs in a spiritualist church is considered entertainment. That is sad when it is our religion. But we must rise above it and try with all that we believe to prove life after death as always.
There are so many gifts that people have which are unexplained by science. It does not mean that they do not exist!