I haven't a clue about special tools or anything but we always use davies and stevens on beeches road in loughborough (01509 217355) who could advise you even if they can't do the work themselves. They are always really helpful, very reasonable and even fitted our seat rails for us. We only live round the corner on albert prom if you need a lift home while you wait!!
Hi,you could try a bloke called John Bradbury 07850226901,(he lives in loughborough)he's a moblie mechanic so would come to you or place of work.He's been doing all the work i need doing and two mates vans for last couple of years with no problems.Very good rates but usually very busy(about four weeks to get booked in).