I fitted a garage door opener a couple of weeks ago...always wanted one...should've got one years ago!! best thing I ever did. they're on offer at B&Q...from £82..
B&Q Online: From Kitchens & Bathrooms to Sheds & Paving; plus planning tools
I got the quieter belt driven model @ £131. Fitting looks a bit daunting at first, but take your time...read the manual...it's a doddle. 2 remotes... I keep one on the sun visor...opens the door from 100 yards away. dead chuffed!