As the rally at York was packing up I saw many folk walking around with bundles of Brompton-sized Marathon tyres, and just caught Spa Cycles as said tyres, unsold were about to disappear into their van £6 for regular, £9 for 'plus' Apparently old model, and a changed tread pattern.
Spec has changed - one of my current tyres is smaller that the other 32-349 vs 37-349 it seems....
Other bargains may be available.....locally too?