Dave Coulson at Bonus has a good reputation, I did a renewal with him a couple of years ago after having let my rating lapse for nearly 5 yrs and gained a great deal from him a both instructor and as a person. Having said that I did my initial SE, ME & night at Leavesden with Pete Godwin and again he is very good and very experienced as well as highly qualified.
I have not flown with Lindsay Brown over at RFC, but he is very good and has a good rep. Lindsay's real problem is time! He is a thoroughly likeable fellow and most people speak highly of him.
Eitherway I reckon you should be in good hands. Dave Coulson's about the best to get you through the fastest - but be advised you need to fit in with him. Read the 'Rules of Dave's Dungeon' posted up in the lecture room by yours truly and if you follow them you'll be fine.
Good luck and enjoy it whoever you choose.