Travelling to Britain can be very expensive with a travel agent or language course, costing several thousands of euros for just a three or four weeks stay.
However once you have a good level of English it is relatively easy to set up your own holiday, which with a little planning, a little luck and a few days hard work, will make a much more interesting and more economic trip, designed around you and your interests.
Having personally worked for many years as a tour guide and summer school coordinator and having planned such holidays for myself. I can recommend spending a few evenings looking for flights, car hire, train timetables, entertainment, events, places of interest and accomodation. All this information is freely available on the internet.
If you need more help click on some of the links above.