Was this your picture Mark? If so you must have an awesome camera or else someone flying was very low!!
There is only one BBMF Lancaster , last year there was indeed a second Lanc gracing the skies here but it is normally based in Canada. The third Lanc is somewhere up in the Midlands or North of England , but is restricted to doing fast taxying up and down the Airfield altho' I believe there may be plans ( if they can find sufficient sponsorship ) to get it airborne again sometime in the distant future.
Now that would be good!