Hi Jay (& Jay)
There is nearly always a ride on Tuesday and Thursday evenings, starting at 19:15. Keep your eye on the BM thread for details of the meet point. The Tuesday ride is supposed to be the slower ride, but it really depends who turns up. The weekend rides tend to be a bit less organised, but if you keep a look out of either site there will often be somebody posting up details.
And it is proably best if you jump straight to the last page of the BM thread otherwise it will takes you weeks to plough through all 400 or so pages...