FloaterNW - My aim at the moment is to work towards a fATPL(A) - I am merely trying to get the same dispensation from some of the exams that an ATPL(H) holder would get in order to make life a bit easier. As an aside I believe another company based further south east at an airport in the cotswolds is in the process of getting certification to do atpl skills tests on the AS355.
Rotormonkey - Having just looked at CAP804 it seems like re validating the IR(H) could well be cheaper - with a valid IR(H) the single engine IR(A) drops from 50 to 10 hours whilst a multi engine IR(A) drops from 55 to 10 hours - Section 4, Part L Appendix 6 (Page 424, 425) paras 10.2, 7 & 8!!