Central Heating System Whining I Think it's Noisy Pump?

[Griggerz]

Hi My central Heating system make a whining sound that I think is the pump. It isn't very noisy at the pump but the sound echoes around the house. Im assuming this is low noise from the pump being amplified by the pipes ect.
Could anyone let me know if this sounds like the issue?

I have had a look around and there appears to be numerous models and specs available. This is a picture of the British Gas one that is installed that doesn't really tell me much as far as buying a replacement. Can anyone point me in the right direction please.

Cheers Griggerz