Hotels.com UK operates as part of the bigger Expedia group, which means their inventory is massive. You get the usual hotel chains, but also independent guesthouses and holiday lets scattered across every corner you'd want to visit. The search interface is straightforward enough, filterable by price, location, amenities, and cancellation policy. They've invested in making the "free cancellation" angle clear upfront, which saves the panicked emails later when plans change.
Their member programme is where things get interesting. Join free and you rack up points on every booking, which converts to discounts on future stays. Spring usually sees them push the "25% or more for members" promotions hard, and these aren't small print nonsense either. The discounts stack on top of already-reduced rates sometimes. They also run flash deals on the homepage and shift their focus between hotels, rental apartments, and car hire depending on what they're trying to move.
One quirk: they occasionally cross-promote with other services. You'll spot odd things like COVID test discounts bundled in with hotel deals, or partnerships with Curve cashback. It's a bit scattershot, but if you're booking a whole trip, worth checking what extras might apply. The cancellation policy has genuinely improved since the pandemic gave everyone trust issues, so that's a point in their favour.