You need to be aware that the UK CAA do not have the facilities to do the "proper" bridging exams. Our workaround is to bridge to the JAA CPL(H) by taking POF(H), then when you have enough experience, claim an exemption for the rest based on your ATPL(A). This is because the only difference between the CPL(H) and ATPL(H) is the IR. Strangely this would appear to be true after April, even theough the "new" CPL(H) will have less study. Go figure.
Other countries (i.e. Switzerland, Swden) may require you take Perf, Ops, AGK as well.
phil