They are there until April time, then moving back to old premesis I think. Being local I have found the best way to get hold of them is to go down in person, however Marc has always responded to me within 24hrs if I have e mailed them, or left a message to contact me.
Not sure about the site phone, it is answered most of the time, but I know that Jason is always on call for the lifeboat or up to his eyeballs working on a boat, so his mobile probably isn't the best way to contact him.
I have been out on a couple of the last boats they have built, and they look spot on. I think they have resolved any problems with suppliers and new boats are being completed on schedule, the understanding I have is that a lot of the time it's payments from customers which have been holding the process up. They are due to start my new 7.5 a week on Monday, and I'm confident it will be completed on time.