St Tropez was the original manual tan and you can still buy the starter set from Ellisons I think.
It was a good treatment (before spray tans had been invented). Much more hydrating to the skin and no vapour issues.
You started with a face and body exfoliation; we used to then put them in the shower to make sure it was all washed off.
Then you moisturised all the necessary dry areas and applied full strength tan, massaging it in while wearing tight gloves.
Face, you did at half strength. At the end, you buff all the guide colour up so they look ok to go home.
There is a definite technique to the application to get it right.
There used to be a video by st tropez on you tube for the manual tan -it might still be there.
Some spas still do the manual tan as a more luxurious body treatment.
The colour used to last better than a spray tan actually.