Butlin's lowest price guarantee - multiple claims?

InsertUniqueNameHere

I booked a break with Butlin's last week, then saw a couple of days later that the price had dropped so I contacted them and they straight away refunded the difference - yay!  It took a bit of searching to try to figure out how to do this, but was I was happy with their speedy (within a couple of hours) response confirming they'd refun the difference.

Does anyone know whether you can claim multiple times on the price guarantee (if the price drops further) or if they only do it once?  I'm not quite sure whether the already lowered price means it's no longer the 'original break booked' as mentioned in the the second bullet point below.