Considering the current trend of CHC London, Employer's verification is not being carried out physically or telephoniocally. It seems that they are driving conclusions merely on the basis of documents (appointment letters, experience letters, salary slips etc) submitted alongwith application.
CHC Islamabad was surely verifying the employers in 2009 & 2010. The same was done in my case in March 2010. After shifting of cases to CHC London, I have not seen any one for whom employer has been contacted by CHC London. If any one knows any such example, please do share.
regards