Genlemen/Ladies,
Look at this as a Risk Management exercise.
Technically or academically (I am not familiar with UK CARs or whataever) you may be allowed to carry out this approach. However, the accident stats indicate that you have a very high risk of a prang and hull loss.
My company has gone so far as banning Circling Approaches in their Ops Specs (as a result of the Risk Management of this manoeuvre).
I, personally thank my company for reducing my Blood pressure/Heart rate.