@smokie You've said you don't want to keep throwing money at the problem, and we all understand that. As @lotharmat has said, VM provide a basic wifi capable router, and that's the end of their responsibility, if it doesn't perform in your (or my) property then it is down to us to resolve that. Unfortunately, I can't see any option that doesn't involve more money:
1) Upgrade (pay more) for Ultimate Oomph or Gig 1, and then request two or three pods (bearing in mind that you may have to jump though hoops to get your hands on two or more). Work out how much that will cost over the 18 month contract, see if it makes sense to you.
2) Hub in modem mode, buy a competent mid price router (eg lotharmat 's TP-Link Archer C7, £50) and connect the BT disks to that. Not a full blown mesh system, but the C7 will be far better than the underpowered Hub 3.
3) Hub in modem mode, buy a competent entry level mesh (plus switch if you need more ethernet ports), say a TP-Link Deco S4 (£100 + £15 for a switch) and sell the BT disks.
You can't get away from the problem that VM's hubs are mediocre routers designed to be adequate in undemanding use, with limited capability and buggy firmware. The Hub 4 is little better in most respects, because the makers design these to be as simple and cheap as inhumanly possible. Obviously some other ISPs offer better hubs (BT hubs have always had better wifi than VM hubs, Zen Internet hand out a rather splendid Fritzbox router), so you could switch ISPs if you're out of a fixed term contract. Or when you phone VM to cancel, tell the retention agent it's all because of the poor wifi, but you'd happily stay if they can provide you with a couple of free pods at no extra cost, and see what happens then. If you're in the middle of a fixed term contract, then you have no leverage, and with early termination charges you won't want to leave, so that brings you back to options 1-3 above.
I'm a Very Insightful Person, I'm here to share knowledge, I don't work for Virgin Media. Learn more
Have I helped? Click Mark as Helpful Answer or use Kudos to say thanks