Hi Ian,
Surprised to see the comments above on here, I have personally replied to 2 of your emails, and again to the same e mail you sent again today. Maybe check your spam box? We have been receiving and replying to all emails in our normal manner and I have had no issues of emails not going through. Anyway please do check through your mail.
On the info your after regarding your image, I would say it'll not print to well at the size you want and would recommend a 30"x20" size instead, your photo and the pixels will hold together much better. As for the logo send it to us separately and we'll apply it to the artwork ourselves. Simply email it over with a transparent background.
Hope this helps. (I have said the same in your e mails I sent earlier)
Thanks Ben