That indeed shows that your local home network is not the issue and also that from Cloudflare* to Tranquility then there are no issues either. So the issue is somewhere in Virgin Media’s network, in between your home and Cloudflare. If you are in the UK and VPN-ing to another place in the UK, you are simply redirecting the traffic slightly to bypass whatever fault or issue there is. I’m very confident that senior network administrators at Virgin Media will be able to resolve this, the issue at hand is simply getting their attention.
*Tranquility is fronted by Cloudflare; your connection to TQ should normally go directly to the nearest Cloudflare colo (there are 3 of them in the UK, 250 worldwide) and is then carried on Cloudflare’s backbone to the datacenter in London where TQ is.