Why on earth are you planning on going on the M6?
Caterhams aren't meant for motorways, and the spray and standing water on them, particularly in lane 1, make for a very unpleasant and potentially dangerous experience (not only from a driving perspective but visibility to other road users, and the lack of safe stopping places).
Plan a non-motorway route as that allows you to stop wherever you like/need to and you can fit or remove the half-hood in a few seconds to suit the conditions, or just take a break and let the weather pass if you feel uncomfortable.
The journey will be MUCH more pleasant, less stressful, and probably safer.
The Completely Superior Ride Seven
It's the route I know.
Having been in Cheshire late October and seen the state of the flood water, dirt, and blockages, I'd suggest its pretty hazardous on a non motorway route if the weather is bad.
Accordingly to the AA route planner, a non motorway route is 2h 40mins to the ferry port. I'd need to be there at 12:30pm, that's not long if you account for Oakmere opening, paperwork, car check etc. The next boat is at 2am in the morning, and I'm into freezing conditions and night driving.
The comparative motorway route is 1hr 16mins.
If your out for a nice drive yes great keep of motorways but some times they are the best way ,,we go every year to Scotland ,always make the first night in pitlocry ,when you get of the boat at heysham ,then it’s a 250 mile run up so go up on motorway so get there about five nice shower out for a drink and a meal ,,,,then of up west coast
I may have missed something, but how are you getting from the ferry to Oakmere?
I'll probably fly in. I have the return leg of ticket from our recent Cheshire trip, the Exige didn't come back with us after I took the decision to swap.
The fast craft is terrible, and unreliable this time of year. If the weather is bad it's likely canceled anyway, I'm not even sure its still a service at present.
I want to get it tucked up and dry in my garage, I doubt Oakmere want it taking up space.
If it is wet and only a few degrees centigrade, the ZZRs will have very little grip, compared with other cars around you will probably have about twice the stopping distance. I have found with my R400 that it is pretty well impossible to get enough heat into 'R' compound tyres in those conditions, leading to wheel spin on the track being available in all 6 gears. In those conditions I leave my non R-compound tyres on to regain some grip.
If it is below freezing, there is a risk of cracking the tyre compound, besides the fact that grip levels will be similar to on snow in a normal car, even on dry roads.
If I was you Mark, I wouldn't drive on those tyres below about 5C on a dry road.