Looking to start a test e/c + masteron p cycle, most reliable UK labs?

First cycle in the UK, what are the well established names in terms of reliability that will deliver to my door (south west England). Also my first cycle using DHT derivatives, so I'm going with masteron p since I'll be able to clear my system of it if I get bad sides like severe acne or balding (I don't think I'm very susceptible but just to be safe) but I would be willing to go with masteron e? Is the performance significantly better? Is the pip and risk of allergy to solvents much lower?