Most people on here do not show their Rabbits,but there are a few members/Breeders on here who do. They seldom post though. You may find some more information (which will be pro showing) here:
http://www.thebrc.org/
My personal opinion, (not that what I think matters to anyone but me !!), is that there is absolutely no benefits to the Rabbits from Showing. It is all for the benefit of the owner/breeder. A boost to the ego for them, a bit of competition between other breeders etc. Some Rabbits may adapt to all the stress of travelling, crowded shows etc. Many will find it all very stressful.
I would never Show a Rabbit, other than on here via lots of Photos of my Rabbits happy in their home environment.
Also, with the current serious situation regarding the 'new' strain of RVHD, 'RVHD2' I would not go anywhere near any show where Rabbits were present.
http://forums.rabbitrehome.org.uk/showthread.php?452651-Important-Information-Re-RVHD2-Please-Read
Relatively few Breeders vaccinate their Rabbits anyway and at the moment the RVHD2 vaccination programme for any owner/breeder wanting their Rabbits to be vaccinated has only just (this week) begun.
It's bad enough that over the last 2-3 years some Breeders have started to import Rabbits to the UK (not sure about NI, where you are) from parts of Europe where the RVHD2 outbreaks started