No, but their service has been terrible for me in the past month.
5.5M in the morning and only 248K throughput in the evenings (measured using this site) Until last month it was 5.5M all day.
Plusnet say that it's my router - I've tried two, and two microfilters.
It looks like terrible contention, but the exchange reports no capacity issues.
It's too slow for me to take my online video based courses in the evenings - I'm going to have to get up an hour earlier to do them before I leave for work at 7:00