We bought 2 of these used 175w panels from Bimble.

They seem to be in good nick, and a lot cheaper than the new alternative. Given the frequency with which we get scraped by low-hanging branches, I’m also not so keen to invest in something super-pricey on the roof.

We also bough various extras including cable, aluminium mounts, MC4 connectors, adhesive, and a cable entry box.

£68 each from Bimble Solar.