The taxes I mentioned are part of the cost of running an office - especially local government taxes ("rates" in UK parlance).
The £9K figure _doesn't_ include taxes on individuals, such as NI and pension contributions. That comes from a different budget, and is typically an extra 25% on top of salary.
I lumped a few costs onto that, which aren't taxes, but are tied to salary. Pension contributions, life insurance, health insurance, for example - these all come out of the same budget as national insurance contributions.
