Ilesmark, I fear you may be slightly confused if you think pressure setting has an effect on the position of a FAF
Having looked at flightradar, it's clear that the a/c leaves the Lambourne hold (NE London), travels west over N. London towards Wembley, before turning left, onto an easterly heading. You may have seen the a/c during this left turn! After travelling east it then make a right turn to intercept the ILS around Burgess Park.
It all seems pretty standard for a LHR arrival. The ILS intercept in this case, as in most cases, looks to be around 10 or so Dme.