Hi arabicradiostations. If you are Turkish then please post in Turkish (as that is the intention of this section). If not then please post these kind of question in the other sections.
I don't know when in the UK you live but the further North you are the weaker the signal. In the south where I am located I would be very surprised if anyone can get a decent signal with less than an 80cm dish. I have a 1.2M and even that loses the signal in very bad weather conditions.