What's the customs situation like with Gearbest? Do they declare the full value of the phone? (I'm tempted...but not sure whether it is much of an upgrade over my Note 5)
I'd agree if it were a £300 phone, but at this price, personally, I'd always go with the savings. This is just me, and others will definitely prefer the UK price you've just linked to. I've no problem at all with that.
But £25 is about 20% the value of whole purchase so the cheaper the better I think
The deal posted yesterday for the same phone is better IMO. From UK, it has a guarantee, definitely no customs and arrives in a couple of days, got to be worth the extra paying £25 for. https://www.hotukdeals.com/deals/redmi-note-7-4gb64gb-15359-redmi-note-6-pro-4gb64gb-12799-ebuyer-ebay-3251887
Halifax Clarity Credit Card may be better for you if you want to be sure of Section 75 protection: link