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Electricity in the UK is often 3x or more expensive than electricity for the same energy content. We have some of the most expensive electricity in the world.

Yeah a COP of 5 is very good. 3 is much more typical.

And OP is right. When I've looked into it you aren't going to save any money going to a heat pump; in fact it will likely increase costs slightly.

So it really only makes sense to do when you need a new boiler. If you don't, it makes way more sense to get solar because that's also good for the environment but actually saves you money.

COP of 5 when running in perfect conditions (load, EWT temps, variable stage compressor, infinite heat sink/source). You might want to research how realistic constant COP of 5 really is.