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Composite hardware is fairly common, genuinely waterproof boots, less so. But unless you're stood in ankle-deep water for any length of time, you don't need it.
Toe caps wouldn't be a bad idea if you're kneeling a lot, but wouldn't swing it one way or the other for me.
Honestly, you'll be fine with whatever your local merch has in stock around the £45 mark (but Magnum if you want a specific recco).
Engineer/surveyor etc? Aren't Rigger boots still the go-to?
If not, whatever flavour of £40 boots are in stock will be fine for occasional use (they're largely all rebrands).
If you want boots made by the people who's name is on them, look at Magnum. I paid £80-odd for my Summer pair and around £110 for the Winter ones.
£180 is ridiculous unless you have specialised requirements.