Classic LXFF & FF Fanned Flue Gas Boiler won't ignite!?

I've followed the instructions and tried to reignite but it's as if the boiler doesn't realise its cold and just comes on and waits. I've read a similar question by Barbara "How do you reignite an Ideal Classic LXFF & FF Fanned flue gas boiler?" in October 2006 where Mike answered about a loud dronning noise. It sounds as normal though and no further help was given.

Does anyone know what might be the issue? It's very cold so any ideas would be great!!!