Hey LaurieIan, check out the following message boards and post any questions you might have about Comair. Additionally, read all threads concerning COMAIR. The sites are:
flightinfo.com (go to the hangar section)
ilsapproach.com
jetcareers.com
ufly.com
Also, write to Comair about the VISA status. If you are a US citizen its no problem but if not things tend to get complicated.
Also are you just looking to build time or complete your CPL + IR and then go back to London and convert your licenses.