Thanks both - I thought it might be too good to be true!
I had to replace the Data Switch about a year ago at a customer's site, and nobody could tell me where to return the removed kit to, despite several phone calls... well, if they didn't want it back, I figured I could use it, posession being 9/10s of the law...

Replacing it didn't solve the problem, so it seems to be good.
Anyone want it in the area Herts/Beds/Bucks/Cambs/Northants/Oxon??? For the price of a couple of beers?