500man
You can fly a tight oval circuit in any aircraft, but it is very bad practice to fly a circuit that is not the one published.
A number of years back a Cessna 150 flown by a mate ( with a young passenger) was hit by an aircraft doing a non standard circuit, all were killed.
Before anyone jumps on me this is a general comment as I am not in a position to comment on the Shoreham accident.