I love the way the Virgin roster has you reporting at LHR one hour before your report time at LGW and then it says 'LIMO', implying that there is Roller manned by Carruthers ready to whisk you at speed round the M25.
In fact it's a smelly old bus driven by a bloke called Bob with halitosis, and it leaves on an hourly schedule. So you could actually have to report to LHR up to 1 hour 55 minutes early should you wish to take the bus. So most people just continue to drive themselves round to LGW and save themselves the bother of parking at the not too convenient staff car parking at LHR, getting the bus to the QE building and then getting on the 'limo'.