One thing thing that is certain is that there are many ISPs out there that will serve you better than Pipex.

If vivaciti/Entanet works for you then that is simple and the right price. Even at its worst I would be surprised if it were not better than Pipex.

If it doesn't then we look at just a few alternatives at a few pounds more.

My recommendation stands .

Can't fault that decision. If anything, the isp will have a usage monitor, such that you might then in a month be able to reconsider through knowing more.