I have had correspondence with my service provider ( Fasthosts ) where I explained the problem I am experiencing. They themselves put up a dummy form onto my test-site that sent emails to my address and it worked fine. They claim it must be an issue with the form scripts on my form even though I explained it was working for you. I'm going round in circles here and now have run our of ideas of where to swing next?
Jason are you able to set the form your to have it send an email to my address - firstname.lastname@example.org. I just wonder if things aren't working properly from my machine, if that is ever possible!