Today I discovered the difference between professionally built wheels and my home built wheels. I thought the back end felt a little loose and put it down to low tyre pressure, but it wasn't. I guess the nipples had set into their seats, the spoke elbows had settled into the hub and the spokes themselves had stretched., or I didn't tension them high enough
.
Whatever the drive side spokes in the rear wheel had lost the tension I had originally set. Best bit is when you have built the wheel re-tensioning is so easy. Whipped the tyre and rim tape off, put a 1/8th turn on every spoke and then corrected alignment, back on the bike and it took less than 20 minutes.