The 0800 number has now been disconnected.
There is a short message on there so it won't cost them too much when people ring it!
You cannot get put straight through to an operator if you don't have (or don't indicate you have) a touch tone phone. You have to sit through all menu options and say a number after the beep.
The leaflet I have tells me I need to obtain a form from my local office. I've found a geo number for it, yes you guessed it, it's been disconnected. I rang my local office, went all the way through the menus only to be told I need to ring the 0870 for vehicles!
The offices are open until 20:30, so it is worth waiting until the evening as it's cheaper.