Have a USA Big Muff PI I bought from thelamaking. Nice pedal but doesnt really suit my playing style.
Previous owner added an adapter so you can use it with ordinary pedal power but you can still use the orignal power if you want.

£35 seems to be what they are going for on ebay so £40 pound posted to the UK seems fair. Paypal only.

It is the Big Muff on that board. (thellamakings pedalboard.)

I can take more pictures if you want but shall have to be on my cameraphone so the quality won't be great.