6M long x 3M high.
Norfolk is a bloody long way from me (unless i'm being stupid and they sail from Dover)
Portsmouth is ideal for me, but dover will do if it's better priced.
Speedferries limit is 2.90 m x 7.00 m, so seems you're 10 cm out.
Norfolk line
http://travel.norfolkline.com/operates Dover - Dunkerque - not much further than Calais . You can probably get a deal with them for under 200 quid for LM week. As for travelling via Portsmouth cheaply, try Brittany ferries via Caen. Depends on how far you are from Portsmouth or Dover.
Have fun - and see you at LM.
Bloody el' leaving thurs morning & return monday afternoon with upto 7m long motorhome for the bargain price of £91.00.
I thankyou Kpy, thats even more money for beer.