VM recently introduced a wifi "guarantee" - so see this...
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To address the wifi issues, VM now supply “wifi Pods” (no longer doing cheap and cheerless and poor value “boosters”). Pods are only free to customers on the 1GB, Volt (or old Ultimate Oomph) packages - - so that is you? They are worth trying - they should work for you and VM Wifi is now “guaranteed” to 30 Mbps/room it’s now called… Wifi Max
See if anything in here helps….
https://www.virginmedia.com/wifi-max
You call 0800 064 3850 to order the first one after scanning for blackspots using the connect App.- or just wait here for a VM person to respond in a day or two and they will sort the first one for you. If you do call dont get fobbed off by the offshore CS agents' saying you aren’t eligible - if you are - it is clearly stated on the webpage.
But iIf you do want to invest in your own better quality equipment, you would need to get either a… (1) Mesh System, (2) Wireless router, (3) Wireless access point(s), (4) a pair of good quality Wifi Powerline Adaptors, or a combination of (2&3).
£40-100 should sort it for most customers with an average property and usage. Spend more for additional advanced“features” - if required.