Just taken delivery of a mixed bag of X10 equipment won on an eBay auction for the equivalent of $30. Wasn't holding out much hope as it was described as "equipment removed from an installation and untested". Outside of the usual lamp and switch modules and some remotes a number of X10 security sensors were included (very useful for automation purposes obviously).
A real surprise was two items labelled XPTT and XPTR. On further investigation it appeared that these were solely for the North American market yet had a three pin UK/Euro plug attached to the flying lead and being in the 220v world I was surprised to see them included.
Out of curiousity I followed the instructions as per this link
http://site.electricsuppliesonline.com/documents/x10/xptt_xptr.pdf and lo and behold the items worked as per the instructions. I did a quick check of the power lines to check signal strength and everything checked out ok. It was firing off the on/off P1 signal and the lamp module responded accordingly.
Obviously this is X10 Pro equipment but I see nowhere that there was ever a UK/Euro version of this equipment manufactured. @JeffVoip do you know if this was in fact the case. Anyway as it happens I now have a very useful piece of equipment in the bag at a fraction of its original cost. I noted somewhere that this equipment was being rented out at $7.50 per week back in the day.