This opens up the age old debate around whether or not you should have a keeper on the subs bench. The way I look at it, the goalkeeping position and the two centre halves are probably the positions statistically most likely to get sent off (professional foul, handball outside the area, etc.). A few weeks ago for example Bazza was sent off on his Stamford debut and not so long ago Greg Tempest had to keep goal for us. My choice would be to have a keeper amongst the five subs, assuming of course that there's a second keeper in the squad. The FCUM result proves what can happen when things go wrong and there's no keeper available.
For the same reason I'd also try and always include a player who could cover the central defensive position. A few weeks ago for example our subs bench was regularly being comprised of Robbins, Sands or Jones, Johnson, etc., etc. Arguably they were the only players we had available, but we might have been in trouble with a red card or injury for Garner or Piergianni. At least the new loan signing from Sheffield United should has now given the squad a better balance.