"Anyone know if the fact that I've lived and worked in Switzerland and held a B permit will help me move back post Brexit?"
It should... but only as long as the Swiss authorities have not cancelled your B permit due to you being away for more than the allowed 6 months.
It also depends if your permit was tied to an employer or allows you to take other employment.
However, if your permit has already lapsed or been cancelled when you deregistered, I think you are pretty much back in the queue with all the other 3rd country nationals.
These pages may also help:
https://www.sem.admin.ch/sem/en/home...arbeit/uk.html https://www.sem.admin.ch/sem/en/home...ne-rechte.html https://www.sem.admin.ch/sem/en/home...it/uk/faq.html
The last one has this (not very good news for you) example FAQ:
6. How long are these acquired rights valid for? And is it possible to lose these rights? The rights acquired under this agreement are valid indefinitely, provided the conditions stipulated in the agreement are met.
The acquired rights are lost once the terms of the agreement are no longer met.
Example 1: A UK national who gives up their residence in Switzerland by announcing their departure to another country cannot ‘reactivate’ their acquired rights at a later stage. If they do not announce their departure, their short-stay permit or temporary residence (B) permit expires after an absence from Switzerland of more than six months. On request, a permanent resident (C) permit can be maintained for four years in case of absences from Switzerland.
Kind regards
Ian