Quotation back from Nutt;
5 x motorbikes with single rider per bike
£172 each ferry only return, cabins are an extra £65 for each leg.
Outgoing Liverpool to Belfast
Thursday 2 June @ 2230 depart
Return Belfast to Liverpool
Sunday 5 June @ 2300 depart
Not sure if I'll be organising a group over, but this should give you all an idea of cost.