The problem with Wi-Fi is that it can be brilliant at breakfast time and useless by lunchtime and you haven't changed anything, BUT, something, somewhere has changed, then you can spend hours and even days trying to find a fix for something that can be totally out of your control.
If you remove all the internal walls, electronic and electrical devices, metallic pipes and conduits and wrap the whole building in a thick lead shield you will have a good chance of getting decent Wi-Fi from a VM Hub.
Many people have accepted that the VM Wi-Fi is poor and have purchased third party equipment that is much, much more powerful than the VM supplied kit and once set up have wondered why they waited for so long.
----------- As your wired connections are all ok, then getting your own wireless equipment will solve any wifi issues permanently, and will be transferable to other BB suppliers kit should you move supplier.
1) A Mesh System 2) A Wireless router 3) A Wireless access points OR 4) A combination of the above
Depending on your requirements for... better routing features, your house layout, size, construction materials, your tech abilities, and of course, budget. ~£60-80 will get a decent introductory wireless router but may not alone solve the wifi in your house, and spending up to ~£3-500 will get the Rolls Royce solution of a high-end Router & WAP's or a top end Tri-band Mesh system.
You'll probably want something suitable - somewhere within that range - I reckon ~£100-150 is around the “sweet spot” for most standard users, and where you would probably need to start for a standard 2/3-story house if it has brick walls.
Good options for Access points are Ubiquiti, (routers also) and from these companies for their WiFi routers or Mesh systems - Asus, Netgear, TP-Link Deco's M4/M5, Linksys Velop's, Tenda Nova's, Netgear Orbi's (and other Mesh's - get triband if you can stretch to it) Stick with these companies whose business this is - rather than Johnnie-come-latley's like Google, BT, Amazon etc. Also be sure the router or Mesh specifically say that they have 1GB ethernet ports - some of the cheaper ones only have 100Mbps ports.
Take a look at what fits your needs, tech ability, house layout and budget. Use sites like Techradar & Techadvisor for reviews of "Best Routers" or "Best Mesh". Post again if you want personal recommendations from others on here regarding your short list.
-------------------- John --------------------
I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router +2 Airport Express's. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.