I replaced my entire cooling system just over a year ago (with new parts) but have discovered a small leak on the bottom side of the top hose - on the plastic connector where the end of the metal clip sits in the plastic square recess. (hope that makes sense)

Is there a washer/seal underneath this metal clip that could be leaking and therefore replaced or do i have to replace the entire top hose?

(The leak is a constant drip when the system is pressurised and up to temp - but no puddles underneath overnight).

thanks!

The hoses are sealed with an o-ring inside the connector.
If the hose was replaced it may not be seating correctly, you could try removing it and inspecting. Might just need cleaning up the mating surfaces and re-seating the o-ring, either that or replace it. They are not available as a separate LR part, if the o-ring is damaged it just needs fishing out, measuring and replacing with a generic o-ring.