Hi
I am graphic designer with oodles of experience, have looked at your crest and will probably require the original scanned version saved as a jpeg if you have it, I can do it straight away for you if you can get the file over to me.
email me at liz@twentyseventhirty.co.uk and I will send you a cost for doing the job (it shouldn't be too much)
Kind regards
Liz
