I sincerely apologise. I didn't get enough sleep, which was my own stupide fault, and completely misread message.
First ask about some combos you haven't had. Herceptin + navelbine has definitely been used by other NHS oncologists and it couldn't hurt to ask. There are some phase I trials for which you might qualify in the UK, but I didn't see anything with pertuzumab. See
http://www.clinicaltrials.gov and enter united kingdom in the search engine.