Jackonicko, you are absolutely right in everything you say except for the assumption that navalised typhoon is a credible option.
We will buy JSF regardless. UK has a very good work-share which has been won on best value and not future orders. Futhermore; (top ISS word) we will no doubt change the magic equation which tells you how many aircraft you need to buy to assure x number of FE@R, to save money. But this doesn't stop Typhoon being the best ac on the shelf for CAO and JSF being the best for AOSE and IAO.
PS. If you don't understand the abbreviations, then you don't deserve an opinion.