A simple explanation of the data would be that.....
1) something is affecting your wifi speeds in your home - would be interesting to check that out by asking one or two of the neighbours to bring their lappys/phones to you and see what they get on your Hub
2) the wifi "capabilities" of the other ISP routers is better than that of the VM equipment. In which case getting your own bespoke router/access point will fix the problem
-------------------- 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. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.