That was little comfort as Catt and Peter Richards ran the show, Peter Hewat kicking superbly for 15 points.
Three first-half tries from Peter Richards, Tomas de Vedia and Peter Hewat gave them a 19-0 half-time lead with Hewat adding the fourth late on.
The leading contenders to replace him for England are Bristol's Shaun Perry, Gloucester's Peter Richards and Andy Gomarsall of Harlequins.
Geoff Appleford and Ben Gollings grabbed two touchdowns each with others from new boy Neil Baxter, Peter Richards and Pat Sanderson.
Olly Barkley and wing David Strettle drop to the bench, where the uncapped Bristol prop Jason Hobson is promoted alongside London Irish scrum-half Peter Richards.
Delon Armitage, Nick Kennedy and Peter Richards were the other London Irish players named in the elite squad in July 2008 and for the autumn internationals.
Other England Sevens players on display include Pat Sanderson and Ben Gollings (both Worcester), Peter Richards (Wasps), Kris Chesney (Saracens), Leon Lloyd (Leicester) and Simon Amor (Gloucester).
The visitors started to get back into the game and after Gloucester scrum-half Peter Richards was yellow carded for a second show of dissent, they looked the more threatening.
Exiles scrum-half Peter Richards failed to re-appear for the second half, prompting concerns over his fitness as he joins the England squad on Monday for training ahead of the Six Nations.
The other changes are on the bench where Steve Borthwick will provide second-row cover, as Corry is promoted to the starting XV, while Andy Gomarsall takes over from Peter Richards as back-up to Shaun Perry.
The rest of the half was a fascinating duel of attack and counterattack, with Peter Richards denying Irish their one clear chance of a second try by intercepting Bachop's pass on the Quins tryline and running the ball out of trouble.
The other players released to play for their clubs in the EDF Energy Cup this weekend were Gloucester centre Olly Barkley, Leicester trio George Chuter, Jordan Crane and Dan Hipkiss, London Irish duo Shane Geraghty and Peter Richards, and Wasps prop Tim Payne.
The ceremony at the Cenotaph was attended by the Chief of the Defence Staff, Gen Sir David Richards, and the professional head of the Army, Gen Sir Peter Wall, along with servicemen and women.
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