As I had already bought, there was not much point going elsewhere.
I think you are right to point to the 'dilema' of how we who live in a foreign country, with little of the language, test whether we are getting a good deal when our only frame of reference is UK shopping.
There is a danger that we see everything as a bargain, by this yardstick, and we miss the point that suppliers are not getting their stock from the UK wholesaler and they don't pay their staff UK payrates. If as a result we encourage price inflation, that hits locals too. When that spiral gets out of hand we complain that we are being taken advantage of by greedy traders (whether about the cost of beer or houses), when, in effect, we have created and fuel that rising market.