Highly recommend Solar Style tinting . These guys are excellent and treat your car like one of their own. They do all the dealer tinting for BMW City so they know their way around a Mini. Emily and Shannon are the owners, and they are all about customer service and doing an exceptional job. Just had my cooper s tinted and opticoated a few weeks ago and they are great. ( No I don't have any affiliation or friendship with the owners. They were just great) I had the XP tint done as it has the best heat resistance. Unless you want to go for the crystalline, which is way too expensive for me
http://www.solarstyle.net.au