I ride a 1982 BJ 531C frameset which I bought a few years ago in mint (i.e. never built) condition and built up with Campag period pieces etc. It is an absolutely stunning looking bike with superb paintwork - a mint green with off-white coloured script, lugs picked out in the same colour and silver-grey banding - lined with off-white on the seat-tube, in the centre of which is the red BJ crest. The same crest is on the headtube on a silver-grey background. I have it built up with mudguards and a brown Brooks Pro saddle in a British day-tourer look.
The geometry is comfortable - it is not an out and out touring bike, but it is more relaxed than my Ilkeston Raleigh. It is my Spring-Fall ride.
I highly recommend the earlier BJs - not sure how present-day versions match-up.