Information about Credit Cards

Hi Guys.

I need information about Credit Cards Issuance in Pakistan. I am planning to go to UK. There online payments through credit cards offer lots of advantages for example, Bus ticket fare from Birmingham to London is 27 Pounds but one can get the same ticket in 1 Pound if bought online through Credit Card.

Many Pakistani Banks are offering Credit Cards. I want information as to which is the best Bank to offer Credit Card which has minimal service charges. I have checked websites of almost all major banks but couldnt understand their service charges.

For example if i opt for a Credit Card and during s specific month I dont buy anything on that card, would I still be giving service charges or not. Moreover what are hidden charges for such cards. Some information in detail will be highly appreciable

Thanks in Advance