Mylaps Harry PT advice please
 

I noticed the bkk website has both new and used PTs on offer, is there much risk in buying a trade in?

They only sell new PTs. The trade in one's are cheaper because you give them one of your old PTs (be it a working or dead MyLaps one or MRT) and you get a new one a bit cheaper. I did exactly this before MRT did their new one as I had a dead PT which was only going to go in the bin which got me money off of a new one.MRT do something similar as well.

Ok thanks for that! I've been looking around and I'm struggling to find a used one anywhere. I may hold out for another week in the classifieds then after that ill just have to bite the bullet!

They are often for sale, but hold their value extremely well.