Flights to Portugal...?

[jedi]

I am going to see my best friend next year who lives in Portugal and the nearest place to fly from was Birmingham using BMI Baby, but now they have stopped flying there and all the other flights aren't direct and because I'm only 16 I don't want to risk that.

Basically I need to know where in the UK flies to Portugal, preferably Lisbon. I know that both London Gatwick and London Heathrow does but is there any other place?

If you try and help me I will be so greatful.