Cheers for all the comments and replies, from what i've read on one hand it seems pointless and a waste but from reading other comments it seems like it gives piece of mind, so I reckon i will go down the umbrella company route.
Cheers to everyone who has replied. Much appreciated. Especially to DiddyDave, your response made perfect sense. Cheers.
However, my personal feelings are that I will never work alone with any child under the age of 18 with parental supervision, even over 18 i would request a chaperone, so there would hopefully never be a situation where I was left alone with a minor. But having the CRB check in place would be a sort of reassurance to any would be clients.