Utility Warehouse do back up their Services with the Triple Value Guarntee, it's not lies.

1 - Guarentee our prices will always be cheaper than British Gas
2 - Guarentee our prices will always be cheaper than the prices charged by the regional electricity supplier where you live
3 - Guarentee prices will always remain competitive with the cheapest standard tariffs available from the 'Big 6'

A seperate guarentee is that we will save you money compared to BT's best prices or your whole bill is free. Not part of the triple value, that relates to Energy supplies, but still a guarentee. As far as i know you can't just go around giving guarentees without any substance or I think you'd soon fall foul of a regulator somewhere.

Hope that helped?