Update - It's now become apparent that Nissan Customer Services blocks your phone number if they choose to...!...Any time my wife used her mobile to contact them for progress on the issue, it immediately cut off, however I tried using mine and I went straight through...tried her mobile again and same result. She then tried on our landline and straight through... BAD BUSINESS, NIssan.....so if find yourself being cut off when phoning, they've obviously had enough of you or, as in our case, don't have a solution.
However, after a lot of boring stuff i.e. time, effort, persistence on our behalf etc., they now claim that Nissan have stated that 'they are working on a new design of seal' for the rear doors....whether this is the truth or another delaying tactic, we shall see...!...