We have been with WebhostingUK for over a year now and they are faultless when it comes to the quality of their support.
They are available witihn minutes any time of the day and night.
We host a large number of websites with them (>100) and never have we had any issues that couldn't be resolved within a matter of minutes in conjunction with their support.
I cannot over emphasise the quality of their offering.
100% recommended to anyone out there