Yes it seems fine.
The radiators are all hot and after a time the thermostat clicks off.
As I said I'm not sure it wasnt always like that, it just seems too quick to go on/off.
I have a Vokera mynute 14-48 gas boiler.
A couple of weeks ago, one of the flow valves for the water started leaking.
I drained the system and replaced it with a straight service valve.
The boiler is working ok however, I have noticed it fires up and burns fine for an initial 5-10 minutes...