Hi Samia,
Dont worry as there are soo many cases transfered to London, the london office is taking long time to process the applications because of 12000 applications transfered from Islamabad to London and your file is one of them, there many applicants who have not received any response from London since April so dont worry you will hear from them soon and send them case specific enquiry, most probably they will give you the standard answer saying "contact us in Oct if you did not hear anything from us by then."
Cheers
Saki