This all makes me very happy! Have been feeling like I’m tied to my employer as the sponsor until this is all over, so this is really great to hear.
The only people who are tied to their employer are those who have work visas for the UK, where their sponsor is their employer... their visa status depends on them remaining employed by their sponsor.
In your case, the employer you work for doesn't matter, because you are a UK citizen, and YOU are your husband's sponsor (not a company)... so as long as you can meet one of the financial requirement categories using your income (or his income, or a combination of both, or cash savings, or non-employment income, or pension income), you don't need to stay with the same employer the whole time.
In some cases, a sponsor may have to stay with their employer until they can reapply for the visa, because they will not have made enough in the last 12 months to meet the requirements under Category B, but it will just depend on each couple's personal situation.
You can change jobs whenever you like, as long as, as the time you apply for the next visa, if you haven't been with them for 6 months yet, you will be able to show:
a) you are currently employed and earning a salary of at least £18,600
AND
b) you have earned at least £18,600 before tax in the 12 months immediately before applying
I suspect it was the original lawyers that told me it’s best to stay employed with my long-term employer for the duration. Glad I now know that isn’t the case this time around and that I don’t have to worry about changing jobs at any time.
Yeah, there's a reason why we don't recommend using a lawyer... because they don't always know what they are talking about and as a result, can give incorrect or bad advice.