I'm after a female escort not the car haha
Gumtree is a useful resource for many of us.
The rules of that site are quite clear, i.e. No Sexual Services can be advertised.
However, those that advertise there fall into roughly three groups, i.e.
1) genuine massage therapists who offer massage and nothing else
2) genuine massage therapists who not only offer massage but will also provide a HE
3) ladies who are totally clueless about massage and only offer FS
Those that use Gumtree regularly will learn to "read between the lines" and be able to distinguish reasonably accurately which group an advertiser falls into. Using sites like this helps to confirm those thoughts.
One thing I definitely wouldn't buy off Gumtree is a car.