Mmmmmmm surreylass, perhaps a little hasty there.
If he will bodyguard or do CP work in the UK, then he will need SIA registration.
I believe all convictions whether spent or not must be declared. More so convictions of violence!!!
philoneill1, just declare it. The fact you have been clean for 10 years will probably go in your favour. It will show you have learnt your lesson etc.
I have worked with some CP trainers in the past, and I can assure you it will be down to your temperment NOW. They couldn't give a monkies if you have a recent conviction for chicken fiddling. If you're the right man for the job, it will not matter.
Good luck with the position.