Varying broadband speeds are why UK ISPs have to state 'up to X Mbps', since they can't guarantee the customer they will get the advertised maximum. Unfortunat

Varying broadband speeds are why UK ISPs have to state 'up to X Mbps', since they can't guarantee the customer they will get the advertised maximum. Unfortunately, this makes it easier for them get away with the 'unlimited' designation, since they're no longer promising you any particular speed.