Got it now Katy.
Did you read the guide
HERE to explain the basics and concepts etc?
The BQM you posted above has some packet loss (red coloured stalactites) and looking at your very first post under the Virgin subform,
that BQM posting, is very typical of many Virgin media HFC cable connections with random latency spikes and said packet loss, which may be down to congestion on the local HFC segment during busy times (evenings especially).
What actual faults are you noticing with the connection?