Rattling from loft

[Helpyourself]

Yikes. We've got Salamander pumps and a newish combo boiler. And the attic is pretty inaccessible.
The noise is more of a shuddering than a rattling and has woken me up.
Are you in London Piglet?

No

If you truly have a combi boiler (no hot water cylinder or cold water tank) why have you got pumps?

No

If you truly have a combi boiler (no hot water cylinder or cold water tank) why have you got pumps?

No

If you truly have a combi boiler (no hot water cylinder or cold water tank) why have you got pumps?

I'll check. We definitely have pumps. Maybe I'm wrong about the boiler. I'm panicking and now it seems the heating isn't working. But I might have jabbed the wrong buttons in my sleep deprived state.

If it's new, call the engineer who installed it.