Just did a chock a block LGW/LED/LGW today - just told pilots to give us a call if they needed anything and we hadn't spoken for a while as we were busy. Worked fine, I called at least 4 times and they called us a couple too. I would say approach your crews before the flight - tell them you will call if they don't - then at least they know what to expect. It's not fair if you are stuck for hours on end. I wouldn't like it and for damn sure wouldn't put up with it - so neither should you!!!!