1. CONCURRENT DELAY REVISITED John Marrin QC

2. Meaning of Concurrent Delay 2

3. Example Period: January to December 2011 Period: January to December 2011 Overrun: January 2012 Overrun: January 2012 Contractors remedial workContractors remedial work VariationsVariations 3

4. JCT Standard Form Cl. 2.32:Liquidated damages Cl. 2.32:Liquidated damages Cl. 2.28: Extension of time Cl. 2.28: Extension of time Cl. 4.23: Prolongation costs Cl. 4.23: Prolongation costs 4

5. Preliminary Considerations 5

6. Prevention Principle (1) Extension of time machinery Extension of time machinery Express contrary intent Express contrary intent 6

7. Prevention Principle (2) Notice points and the Gaymark case Notice points and the Gaymark case Jerram Falkus Jerram Falkus 7

8. The Jerram Falkus Case 1)The Adyard Case 2)SMK Cabinets 3)Peak v McKinney 8

9. The Obverse Problem Inconsistent monetary cross- claims Inconsistent monetary cross- claims Relationship between time and money claims Relationship between time and money claims 9

10. But-for Causation Employers defence Employers defence Necessary but not sufficient Necessary but not sufficient Relaxation Relaxation 10

11. Apportionment (1) The laymans first reaction The laymans first reaction The City Inn case The City Inn case Tennant Radiant Heat Tennant Radiant Heat 11

12. Apportionment (2) Basis for apportionment: Basis for apportionment: Fair and reasonableFair and reasonable Causative significance/culpabilityCausative significance/culpability EqualityEquality Prevention Principle Prevention Principle 12

13. Dominant Cause (1) Rationale Rationale Fairweather Fairweather City Inn City Inn 13

14. Dominant Cause (2) Practical difficulty Practical difficulty But-for test But-for test Prevention principle Prevention principle 14

15. Malmaison Approach (1) The Malmaison case The Malmaison case Subsequent approval Subsequent approval 15

16. Malmaison Approach (2) Prevention principle Prevention principle The But-for test The But-for test The obverse problem The obverse problem 16

17. Prolongation Costs (i)Dominant cause (ii)Apportionment (iii) Contractors claim fails 17

18. Conclusion 18