I don't want to sound doomy, but communications is not a popular subject with the research councils in the open competitions & sits somewhere between the ESRC & AHRC and as you can only apply to one, you have to be very careful which & get some sound advice from your supervisor. Try and look for uni's which already have the funding in place, or have had a good success rate in the opens. This is unless you're doing a blue skies project, but again it depends what specific area of communications you are looking to go into though.
Good luck.