OK, I went for a short ride 20 mile with the wife. Bolt behaved as normal all ride, speed fine as was elevation, cadence etc. I had my old Cateye up and running as well and the speed tallied well and no drop outs etc. Only indication was time was set to GMT not BST, that is I set off at 11:50 but time on Bolt showed 10:50.
On completion of ride I ended it and as with others it showed Aug 2006.
Ride didn't seem to sync with Strava, I didn't get notification etc but searching back to 2006 the ride is there and complete inc segments etc. Using the fitfile tools I changed date and time and ride shows up as today and right time. A slight faff but doable so I'll continue to use Bolt for rides and just adjust post ride until Wahoo send out a fix.