Just fitted one to Mahesh's buggy over the weekend, I thought it was pretty good, took a little longer than I hoped and took a little bit of thinking, but Alan at Premier is very helpful if you have a problem, I wasn't sure how to wire the hazard switch as its a single flasher relay system unlike the Mini.
You will need to use your original Mini switches and connectors and join the connectors to the premier loom.
If you use insulated inline connectors UNDER NO CIRCUMSTANCES USE ONE OF THOSE CHEAP PRESSED STEEL CRIMP TOOLS!!!!!!!!!! That will lead to a lifetime of frustration, they are crap. Invest £20 in a proper ratchet type, you won't regret it
Dave