I have the Elemis tan accelerator. It smells nice and is a nice light body moisturiser if nothing else! I will start using it tomorrow as we go away on the 9th August. I have used the Gatineau one and got a tan on my legs which don't usually get any colour at all. I also bought Lancaster Tan Maximizer/After sun which I read about on a thread here. MN made me buy it!
I find Boots Soltan Tan and Protect spf very good too. It contains the same stuff as accelerators (Tyrosine?) and helps me get a nice colour with very little sun exposure. I only use it on my legs though as they need help to tan. I use Ultrasun on my upper body.