Thanks freddy and Meister.
We have to buy new mirrors, after reading the recent topic regarding towing mirrors on the forum, as we have a new tug and our existing mirrors don't have the requisite 'e' mark on the back, so we thought we would get the new Milenco Grand Aero ones.
Although they have been praised in various caravan magazines, no one seems to have them in stock yet. The Milenco website is only showing the ordinary Aero ones, not the bigger Grand Aero ones. We were hoping to buy some locally, but I think we will have to contact North Staffs Caravans as Tom did.