To answer the question about terrain clearance when extending the outbaound leg(at Cardiff), look at the Radar Vectoring Area Chart. You will see that the altitude of 1600' on that chart (to at least 10 DME in any direction) is within 80' of the platform altitude for the R/W 30 procedure. Clearly this would entail some prior planning on part of the candidate on an IR test.
Unfortunately, to suggest that ATC will provide vectors if they have left you too high is not an acceptable solution to a CAA examiner. If there is no other safe option the candidate will have to go back to beacon and start again.
Clearly the above is only asolution at Cardiff, for R/W 30. In general, I would agree with DFC about terrain seperation and extension of outbound legs of procedures.
Nasib