Went with Toob in the end. There was a 3 man installation team from CityFibre who showed up. I had expected they would bring it up from the pavement, but they had to take it off the nearest telegraph pole. Unfortunately that meant taking it over an abandoned front garden two along (hoarders) and through a very overgrown tree, so they used the old BT landline to pull it across and then removed that. Installation took about 2 hours, and they didn't stay to do any setup of the router despite originally offering to. Think they were keen to get going to the next job.
Had some trouble getting a connection initially, but then I got a text from Toob saying my connection had been activated and the router started working. Took me multiple goes to log in via the LinkSys app, which has terrible reviews so it wasn't really a surprise.
Anyway, it's worked well since those initial hiccups. I would say we're a medium usage household with two adults working from home and lots of smart devices/speakers/laptops etc. The router is very small and unobtrusive in my home, which I like. But I think the signal is a bit weaker than the Virgin Hub 5 that it replaced. I'm looking at whether to get a mesh node to complement it or just buy a better router but I'm really not sure. It hasn't caused any issues, just that I'd rather have faster internet in the fringes of the house. If anyone has experience buying a replacement or mesh nodes, let me know. I have an Asus RT-AX59U here which I could try but I don't know if it's any better than the Linksys SPNMX56 they supplied.