At last, there are official rules to the game known as 'office cricket', courtesy of Conservative Party Researcher, Michael Rutt:
"English Office Cricket .
The Official Rules.
1...If the ball is caught in one hand after bouncing only once off the walls, floor or personnel, the batsman shall be out.
2...A ball reaching the back wall after bouncing will score 4 runs.
3...A ball reaching the back wall without bouncing will score 6 runs but if it hits the left hand side of the back wall the batsman will be out.
4...The batsman will be out if his shot hits:
Sams desk or Sam without bouncing.
The colour printer without bouncing.
A ceiling light without bouncing.
The back window without bouncing (caught behind).
5...A ball will be considered a wide and score 0.333 runs if:
It passes over the Admin Desk.
It passes over the Technical Developments Desk.
6...Siblings of the Managing Director must not throw the ball when bowling.
7...If the batsman is further forward than the filing cabinet and the ball is returned to the batting crease, he shall be out Stumped.
My thanks to Kerron Cross for pointing this out. So Conservative Party researchers do have their positive uses after all ;-)