Nowadays it is relatively easy to start your own hosting company. All you need is a website and to buy a reseller hosting account from some of the top UK hosting companies. This way all you have to do is handle sales. All the tech support, hardware, software etc. is handled by the hosting company you partner with. This is the easiest solution with the lowest investment in terms of money and knowledge and it is suitable for any web design agency or internet marketing consulting service that already have clients.
If you want to take it on the next level, you can rent a dedicated server or colocate your own hardware in a data center and handle all the sysadmin work by yourself. This is a more advanced level though, so if you get to it you would know how to handle it.
