Potterton Combi 80 without power?

My combi 80 does not seem to be receiving power from the electricity socket. I changed the fuse in the socket and this did not help.

All lights are dead on the front panel.

My question is: is this a common problem and will I need an electrician or a heating engineer?

Please help as it's Friday night and we face a weekend without hot water or heat.

Thank you.