Hi Mark,
As I'm not familiar with the ins and outs of the holiday I had been in contact with someone upstairs. I have just been forwarded various documentation which I hope will allow me to give you a full response to your question.
So that posts don't get 'lost' before we are able to answer them, we tend to hold these in the queue until we have a response if the answer isn't at hand and publish as and when we get the answer.
Sorry for the delay in getting this response to you - it will be up today.
Kindest regards,
Julia