From late October to late March, the UK is on Greenwich Mean Time (GMT). Lanzarote is on Western European Time (WET).
Spoiler alert: they’re the same thing. Zero difference. Your phone won’t even break a sweat.
So if you’re sipping a pint in London at 2 PM, it’s already 2 PM on that Lanzarote beach. The sun doesn’t care. You shouldn’t either.