steven.hood has reminded me that I said I would update this thread and I have neglected to do so.
In the end I put the XRP in my Fazer 1000 - and the bike does feel different! The gearchange, which was OK anyway, is a little smoother as is the engine generally. It feels a little more eager to rev. The oil is actually 10W30 instead of the more usual 10W40 grade but is within the recommended spec. So all in all - good stuff.
Usually, like most of us, I can't tell the difference between one oil and another when in the bike but in this case the machine definitely feels better. In fact the difference is noticeable enough that I have actually picked up another 4L (Which I paid for this time!) to stick in the VFR.