Hi,
Not really required for a mini, but there's people on here with other daily drives.
I have a complete Gas LPG Kit I've recently taken off of a Classic Range Rover 3.5 V8.
It comes with Electronics+ Loom, Evaporation Unit, Tank (Large Capacity), and I also have some piping used, but may be an idea to re-new for your own setup as they were for a Long Wheel Base 4x4 vehicle afterall.
Very simple and very easy install with a lot of gains if you're running a thirsty car daily, the only modification required to the car is a few holes for wiring/piping, and altering the Spark Plug gapping.
Will be able to Upload photos if enough interest of all of the parts.
£60, Location: Bolton, Nr Manchester