For water you have no choice of supplier, so you'll be with whichever company serves the area. Drainage is included in the water bill, assuming you have mains drainage and aren't on a sepric tank. If you're in Scotland, I believe that in most cases the water bill is incorporated into your council-tax bill by the local authority.
With the multitude of options in the U.K. now for electricity, the sort of comparison sites already mentioned might be handy, but consider carefully whether you need a single rate, Economy 7 tariff etc. and don't just go with what's already there. If, for example, the house has electric storage heating but one of the first things you're planning on doing is ripping it all out and installing gas or oil central heating, it will most likely be better to use a standard tariff instead of Economy 7 or similar. Assuming that the house has a natural gas supply, you might also get a better deal by getting a combined electric/gas package from the same company.
For telephone and Internet, if you're in certain towns you might have the option of broadband cable service (Virgin et al) or ADSL might be the only practical option. Bear in mind that from the point of view of attainable line speeds ADSL is limited by the physical plant which is all owned by BT/OpenReach, no matter who you sign up with, although there are other factors which can affect overall performance which can vary from one provider to another in any given area.