[With 700,000 documents to comb though][link] it is a totally rational approach. It can either take a team of experts 2 years or it can take “everyone” a few days.
Obviously the potential is there to game the system and make your guy look good or the other guy look bad, but review is a lot cheaper than the original work.
[link]: http://mps-expenses.guardian.co.uk/ “Investigate your MP’s expenses”