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I don't think FX swaps are available retail.
They are, IIRC - it was a Thing™ in the 0's to mortgage your home in a forrin' currency (because low interest rates) using swaps.
It was, obvs, fucking stupid, because it obviated the fact that FX swaps are priced on the difference in interest rates, and any benefit from a shift in rates over time is / was entirely accidental. And you end up paying away a ton in spread.
[Edit] Of course, I just realised that what I wrote doesn't disagree with you in any way, as mortgages are more than £100k, for anything other than a wendyhouse.
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You could find some way to bet on the price getting worse as a hedge?
You'd be looking to buy an option, rather than a future - no restrictions on lot, strike or expiry, and there's less outlay compared to a swap.
A quick google suggest that a lot of FX brokers do retail options.
The spread on the premium is likely far higher than any reasonable expectation of gain / loss though.
If one wanted to move a good chunk of money gbp > eur while rate is good, but didn't want it just sitting in an account - anyone got thoughts? Needs short term (6-12m) accessibility