Hi Mr M, sorry I have not re[plied to your PM, what with raw egg, forearms and a number of PM's from all sorts of people I have been struggling to keep up. Aplogies.
Your circuit is OK, but if you can go from one big exercise to the next with no rest, this suggests you are working too light. Most couldnt do much after a set of correct weight squats- let alone stick deads in at the end.
Rather than circuit these movements, I would try supersetting them instead.
Group deadlift and benchpress together, with weight that hits you hard at 8-10 reps on each respective exercise (set up two individual bars for the exercises- the weights will vary). Go from bench, straight into deads, then have a 60-90 second rest before the next superset. 3 in total.
Next set up the bars for squat and overhead press, same reps, same 3 superset volume and rest periods.
Wont take long, but its a tough little workout.