Well technically not the charge but what you get for it! Having been on different dosages of the same tablets all this year I've noticed it varies.
The first two prescriptions were for four of the 25-strip tablets, and that seemed reasonable(ish). The prescription I collected today contained 56 tablets and the one before that only 28 tablets. But each prescription costs the same amount - currently £7.85 - that's just frustrating (especially when it's so tricky to get to the doctors and so tricky for them to operate timely). Grrrrr.
The optimist in me always thinks this will be the last prescription I'll need which is why I haven't signed up for one of those prescription passport thingys.