Leaking Heater?

[fjw]

hi guys
I replaced the radiator in the Sundowner (this is my first Escort), flushed the heater gently (was blocked) and now it appears the heater is leaking, damp carpet under the driver's mat ... is this a common thing??

I re-routed the heater inlet straight to the outlet hose so the auto choke (recond carby) will still work properly, and will keep a look out for a heater ...
cheers fjw