Was the subcontract a fixed price contract?
Links
[1] http://fenwickelliott.uk/sites/default/files/legal_briefing_31-2007.pdf
[2] http://fenwickelliott.uk/sites/default/files/legal_briefing_28-2007.pdf
[3] http://fenwickelliott.uk/sites/default/files/legal_briefing_25-2007.pdf
[4] http://fenwickelliott.uk/sites/default/files/legal_briefing_27-2007.pdf
[5] http://fenwickelliott.uk/sites/default/files/legal_briefing_23-2007.pdf
[6] http://fenwickelliott.uk/print/research-insight/newsletters/legal-briefing/contract-issues?page=19