I shall take a close look at JW's circuit and maybe see if I can build one. If not I'll happily evaluate one for ScottyDog.
And yes ScottyDog, I did get a reply from Prosport within 24 hours. I couldn't get through on the phone of course
but sent a fax instead asking them to give me a call, and lo and behold my phone rang the next morning
. Still took 5 days for the replacement to get to me, but that's probably something to do with Guernsey Post stockpiling parcels until they feel like sending them the 20 miles or so to their sister island.