a wee bit of advice for next time.
As the left hand dosn't know what the right hand is doing at Gatwick. Its well worth sticking the form in anyway for the dates you require. The offical line is NO but if you don't make a issue of it and take what your given, things sort themselves out (they did for me).
Lets face it if you apply for Gatwick they don't have a problem posting the papers out etc. I would fax the application through for Gatwick and you might have a nice suprise.
MJ