Peppermint.... I think that for LHR it is about every 2 years. The last time they recruited for LHR was Oct 2005, I know this becasuse I have waited patiently for the whole of that time. In between they recruited for LGW, but as you can see by reading, that all went a bit pear-shaped.
I certainly wouldnt hold your breath for another recruitment drive for a year or so. There are many WW CC who want EF and the Gatwick holding people and all the MAN staff etc......they also only 'release' ground staff intermittently to apply.
Infact it seems you have a much better chance if you are completely external.
Lulu