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Thanks all.
I'd read about water damage (it's meant to be partly waterproof and I can't recall getting it particularly wet) or impact (hasn't had an impact and odd that it started as horizontal lines and progressed from there after a good week or so).
I've tried Garmin email support twice now and pushed for any other option with no luck, so maybe I'll phone them as a last resort.
Was it recently that they sold you the refurb and were you out of warranty?
I've not seen the issue, but that seems like a stingy offer from Garmin. They've sold me a refurb Edge 1000 for 75 - 85 quid twice before. One of those times was my own fault - I crashed and smashed the screen. I'd try pushing them for a better deal on a refurb (or jump ship to Wahoo if you're waiting for an excuse to do that anyway).