Boiler cutting out and dropping pressure

[frying_pan_cat]

Recently our boiler has started cutting out and losing pressure when showering in the morning. It will make horrible noises and then all water will go cold. If I then reset it it works fine again until the next morning when it'll do it again. It happens nearly every morning (though for some reason didn't do it this morning.)

There's an engineer coming out next week to have a look but in the mean time can anyone with a bit of boiler knowledge tell me what's likely causing this/any way I can avoid it doing this as it's really annoying having my shower interrupted every morning.

It's a gas boiler, but not sure what other details would be helpful. I'm not too familiar with boilers etc.

Thanks

 

[frying_pan_cat]

Sorry, it's a Worcester Bosch 240

 

[frying_pan_cat]

Thanks, will that be an easy/fairly cheap fix or is it likely to result in a new boiler?