coolant leak on 2004 1.4tdci from plastic coolant pipe which goes from thermostat housing to water pump - I thought it was maybe the housing itself leaking and today I put on a new housing but no change to the leak.

I think the leak is from where the hose clips (has white bit on it which is pressed in) onto the housing but not 100% sure

My question is, is there a seal inside the end of this hose that can be renewed? and could be the reason for the leak?