London is slow in processing. It can take 3-4 months before they respond. Did you send a letter of resignation from your job? If not they might refuse your case because they think you don't intend to move to Canada. London sends a lot of PFL and refuse a lot of cases. Did you send strong proof. I hope your case is approved and not refused.
We provided a lot of evidence for intent to return to Canada in PFL and then we got called for interview. They did not ask anything about this during interview. At the end of interview he said that I have only one bad news for you and that is it will take few more months to process your application. This shows that he knows we want to go back to canada. Also I've noticed that they send refusal letter after interview within one week. But it's been four months since our interview. Have you ever seen someone getting refusal such a long time after the interview?