Quick update:
I've cleaned up and rebuilt my carbs ina bit to sort out my erratic idle and problems balancing the carbs, they've come out quite shiny:

However, one of the pistons isn't closing fully and is closing slower than the other, which is likely to be a problem as much as the faulty manifold gasket was!
I've also been buying new toys this weekend, on the way I have a car computer, dvd player, usb gps device, PCI CCTV system for a rear view camera (can support another 3 cameras). I'm looking at software at the moment that'll hopefully do cool stuff like automatically recording GPS data when the car is on and then upload to a server when a WIFI hotspot becomes available, so I can track Jason if he ever takes a wander!
Don't worry, I'm not about to go all pimp my mini on you, will be a very discrete and functional install running through a touch screen tft on the dash.