The lines are open between 9 & 5 on sat or till 5:30 on the weekend, number is 01772 792 600. I tried them myself about 5 so the lines were working then, I've tried now and I get 1 ring then silence, I think someone forgot to put the out of office responce on thats all.
Try tomorrow and if you are still having problems pm me your number and I'll get someone from the office to call you.
The email you recieved wouldn't be an automated one, so its not due to the site, hope this helps.