milktrip,
On the Brent Field we had North Scottish Bo105 in their white colour scheme, which was used as a 'taxi' against the BEAS 212 'bus'.
I only passengered in a 105 once, but it was certainly very cramped in the back, and there were no duals in the front. ISTR that there was a liferaft stowed behind the pilot's seat which precluded the use of the right rear seat, limiting the pax to three. This may have been a local requirement, however.