I think the open top tours seem to have a problem.
I wonder if it's a 'sin bin' for drivers? (Boy racer driving a bus? On city tour for rest of year!)
Notice a few of them have problems sharing the road with bikes. They drive at 12mph but speed up if you want to get by.
Today I was 'cut-up' by bus 33 at 13.15pm on Bristo Place. This was modern red 'City Sightseeing' one although I've seen other tours drift through red lights and do other dodgy stuff on many occasions. Basically I was in left hand lane and squeezed out by bus coming from left with parked car ahead. Complaint will be made. Still gathering info.
I had a new Helios tandem with child seat on back. Maybe was too high up to be seen properly ;-)