length plus bikerack?

hi, can anyone please advise? have always used the tunnel and booked 'van on as 6m(which it is) but it also has a bike rack. doesn't appear to make a difference on tunnel, however need to book a ferry for next trip, can i book as 6m or do i need to measure with bike rack? (and costing a lot more money). how exact are they? anyone know?helen

Calmac and Northlink ferries include the bike rack in the overall length when booking. i.e. length of van + bike rack = overall length.

Frank