I think Mentaleena has a good point. Yes in the absence of further clearance an aircraft must take up the hold. Nevertheless the MATS Pt 1 does say that "on commencement of radar vectoring to final approach the pilot is to be advised that the aircraft will be radar vectored to intercept the final approach and of the runway in use and the type of final approach". This is backed up by CAP 413 (RTF Manual). Therefore on hearing the phrase "vectors for 33 no. 2" the reasonable expectation is that this is what will happen. The fact that it did not happen for the very good reasons explained by Squidge should not have elicited the response about strictly speaking you should have taken up the hold. I think "sorry about that" would have been more appropriate.