[Laurent Rizzotti]

Actually Coastal Command aircraft were used to reach the 1000-AC mark and bombed Bremen.

An exemple is the Hudson-equipped 206 Sqn:

Later in June twelve Hudsons of 206 Squadron were detached to North Coates for co-operation with Bomber Command. On the night of the twenty-fifth of June, 1942, they all took off within the space of ten minutes from Donna Nook (satellite to North Coates) to take part in the attack on the city of Bremen carried out by a thousand bombers from all the combatant commands. The Hudsons flew in four formations of three aircraft each, the formations being led, by A/S/L. Crook, S/L. Patrick, F/L. Roxburgh and F/O. Wills. The other aircraft Captains were F/O. Bland and P/O. Delarue, F/S. Bass and F/S. Clarke, and F/S. Hill and Sergeant Wright, F/S. Goodson and F/S. Biddell.
Owing to heavy cloud it was impossible to locate the special target allotted, which was the Deschimag U-boat building yard, and bombs were dropped in the vicinity of large fires. None of the crews reported engagements with enemy night fighters although several were seen. Aircraft "A" (F/L. Roxburgh) was badly damaged by anti-aircraft fire, landing at Base with its main spar broken. Aircraft "S" and "M" failed to return. The crew of the latter was Sergeant Wright, P/O. Phillips, Sergeant Payze, Sergeant Speed and Sergeant Peet. That of "S" consisted of A/S/L. Crook, P/O. Watson, F/S. Hubbard. They were accompanied by the Squadron Commander, W/C. Cooke; it was his first operational flight with the Squadron.
The rest of the force landed at North Coates, and the nine undamaged aircraft retuned to Aldergrove on June 27th. An entry in the July log states that:- "On or about this date (3/7/42) the bodies of Squadron Leader Crook and his gunner, F/Sgt. Hubbard, were taken from the North Sea by the Germans."

Source:
http://www.coastalcommand206.com/page3.htm

Of course the above RAF report telling that none of the crews reported engagements with enemy night fighters concerns only the crew that returned. Teh two missing Hudson might well have fallen to nightfighters.