SO - last week, whilst spinning many other plates, I ordered the oil and fuel filters from Calcutt boats along with 10 litres of the API CC "morris" oil from somewhere I forget - it's not cheap and given it's a new engine, I think Canaline/Izuzu/kiota or whomever, are being a bit cheeky get the end user to pay for flushing out their new engine.
IF you are going to pay someone to do this, I'd think again... I did enquire but the "recognised Canaline engineer" wanted circa 250 quid for the "most important" 50 hour first service. In reality, if you can read, you can follow the checks as listed in the manual... it's mostly common sense checking tightness of bolts/belts etc.
I recorded the event photographically to form part of the "service history" and I've signed the book myself!