Potterton Netaheat 50e Boiler?

After 9 years the pilot light has gone out and the heating and hot water have gone off.

When working properly the pilot light is on and there is a noise when I turn on the central heating. Now nothing.

I have changed the fuse and tried the reset button but there is no change. The reset button appears to do nothing at all - is this a switch that is supposed to make a noise ? It doesn't and, of course, the pilot light does not come on when I press this either. Perhaps the switch is broken ?

How do I fix it ?

Thanks,

Michael, Streatham.

Thanks.