بالنسبة للتاشيرة الطويلة الأمد هذا اللي مكتوب بخصوصها في الموقع
If you apply for a long-term visit visa, we consider:
whether you can show a frequent and sustained need to come to the UK (such as family links or an established business connection);
whether your personal circumstances are likely to change significantly while the visa is valid - so you should give us as much evidence as possible that your circumstances will remain the same;
whether you have shown that you can support yourself in the UK without public funds, and that you intend to leave the UK at the end of each visit; and
your previous travel history as shown in a current valid passport.
You should think carefully before applying for a long-term visit visa. We may refuse the visa or issue it for a shorter period than you have applied for (if, for example, the evidence that you provide does not support a long-term visit visa application, or does not meet the visa requirements). If we refuse the application or issue the visa for a shorter period, we will not refund your application fee.
If you have not applied for a UK visa before, we advise that you should consider applying for a short-term
باختصار يجب ان يكون هناك سبب مقنع يتطلب ذهابك بصورة دورية لبريطانيا كذالك ان تقوم بالتبليغ في حالة تغيرت الظروف اللتي قدمت وانت عليها والاهم هوا أنهم ينصحون من لم يسبق له الحصول على التأشيرة بالتقديم على التأشيرة القصيرة 6 اشهر
http://www.ukba.homeoffice.gov.uk/visas-immigration/visiting/general/apply/
