The two men are friends in real life and there’s an obvious chemistry between them.
In the new show they are joined on screen by a wealth of Scottish and Irish acting talent – Amy Lennox, Stuart Bowman, Forbes Masson to name just a few.
McHugh is hopeful it will join a growing list of Scotland-based comedies such as Two Doors Down that have successfully reached across borders.
“Scottish humour has been kept in Scotland sometimes where it should have been shown to the whole of the country,” he says.
“Now it’s being shown to the whole of the country so that’s the most exciting bit.”
Fisher has a more pragmatic take on the matter. “I think it’s good if a sitcom’s on the telly and it’s funny – I couldn’t give a stuff about if it comes from north, south, east or west.
“If it makes me laugh, if it amuses me, if I care about the characters, it it’s well-written then that’s fine – the genesis of it is immaterial to me.”
So is Only Child any good?
“I haven’t a clue,” replies Fisher – clearly a man who doesn’t give praise gushingly.
But then comes a verdict on scriptwriter Bryce Hart’s work which, coming from someone who’s spent more than 45 years in comedy, makes you sit up and take notice.
“I think this is one of best written pieces of work I’ve ever been involved with.”