After the comments about various police regions and the time they take to process applications and variation I was a bit concerned about the reports of delays at D&C.
However, I phoned them up and explained that I had a trip booked on Red Stags and was hoping to get my licence back in time. They said they would do their best. We went through the application in detail to make sure it was complete.
I applied to have my licence opened and to add a 300 win mag. I included a letter from my mentor to say I was competent and a letter for my booking in scotland
It took them 7 days, even though the letter arrived 2 days later. So hats off to them and a big thanks if they are reading this forum.