It would seem that the weak pound is contributing more to exceptional profits for MMC or the french importer rather than providing attractive pricing to french punters.
For reasons best known to Morgan the LHD price list is higher than the RHD price list. I think it averages at about 4 to 5%. The RHD 4/4 Sport, for example, is listed at £25,745.83 plus VAT and the LHD version is £26,800.00 plus VAT. Even optional extras have a higher price despite the fact that they are identical for left or right hookers. The only thing that I can think is that this is to support the additional transport costs. It is true that the Pound has lost heavily against the Euro in 2008-2009 but since then it has levelled out.
Also VAT varies a little from country to country. They have just put it up to 21% in Italy in a move designed to help businesses suffering from the economical downturn.