First of all,I'm a student of ELT.I'm studying English and my choice to learn and speak fluently,effectively is British English.For me,British English sounds better than American English and attracts my interest much more.In my opinion,a foreign language is learned most effectively in the country it is spoken natively.So it is so necessarily and important for me to learn English among English people.It helps me so much to improve myself as effectively as I want.
As to second one,A different country is different life and culture.I mean if I have this opportunity,I would learn much more about British culture and even experience it for a while.For example,
- Punctuality is so valuable for British people.So you should arrive at the exact time specified for meetings,appointments,dinner,etc.
- You should arrive a few minutes early for public meetings,plays,concerts,etc.
- Everyday dress is appropriate for most visits to poeples' homes.But for other events you had better dress more formally.
- Besides,Hugging is only for friends.
- Do not ask personal or intimate questions
- Do not stare at anyone in public,greet people a kiss if you aren't close friends.
- Opening an umbrella in doors,the number thirteen especially Friday the thirteen,putting new shoes on the table are unlucky in their opinion.
- Moreover,I could experience that finding a clover plant with four leaves,catching falling leaves in autumn are lucky.

It is very well-developed. The only suggestion I can make is to combine the following two sentences and make it your thesis statement:
YanıtlaSilIf I have the opportunity to visit a foreign country for two weeks,my choice would be England.My reasons for it are that I'm a student of ELT,that a different country is different life and culture,that a different country means different people.