Yep, some places do. Liverpool, for example, will check out *anything* you put down as employment or work experience, that in your UCAS form and that which you just put in your personal statement. They'll contact someone you designate, basically to make sure they actually did it.
Those places which do though, will tend to ask you to give them the contact details, or they'll find out the head person in that organisation (who will still be around, regardless of them not being a member of the organisation anymore) and work from there. They're so thorough, they'll find it, I'm sure.