Transportation of Board - help!

My newbie pal and i are learning to surf at the mo and we feel nearly ready to get our first boards (cant wait).
Thing is, transportation of said board. We are travelling from Bristol - Putts and im investigating methods of travelling a board. Roof racks for my car are about £100 (i thought that was pricey looked halfords/thule/peugeot).
Ive been to local surf shops and the guys there try and sell us these strap things that you thread through your door/window and attach boards that way with a padded middle bit. We go to Putts a fair amount and i never see anyone else with them.
Then last week we were driving back from Putts and the guys in front just had like a camping mat on the roof with three boards on top tied with dodgy rope. Dont fancy the M5 with that.
Obviously dont wont to be damaging the board or other users of the M5 (no girl driving jokes please). Help....
Thing is, transportation of said board. We are travelling from Bristol - Putts and im investigating methods of travelling a board. Roof racks for my car are about £100 (i thought that was pricey looked halfords/thule/peugeot).
Ive been to local surf shops and the guys there try and sell us these strap things that you thread through your door/window and attach boards that way with a padded middle bit. We go to Putts a fair amount and i never see anyone else with them.
Then last week we were driving back from Putts and the guys in front just had like a camping mat on the roof with three boards on top tied with dodgy rope. Dont fancy the M5 with that.
Obviously dont wont to be damaging the board or other users of the M5 (no girl driving jokes please). Help....