The commission and rate of exchange do vary but shopping around is rather impractical.

手续费和汇率确实各地有所不同，不过到各地去采购是不太实际的。

youdao

They are not proposing that English councils be given the same powers as the Scottish Parliament to potentially vary the rate of income tax - powers that could also be extended to the National Assembly for Wales under the Silk Commission proposals.

BBC: Commuters in London