Harvey Easter (played by Mark Benton), 46, is the eternal optimist. He is able to see the good in every situation, the silver lining within every cloud, the bright side to every bit of bad news.
This, however, is his downfall. Someone for whom the glass is always half-full can be difficult to live with, as his wife of 19 years, Jacqui or "Jax" (played by Rebecca Front), knows all too well. Even when life deals Harvey and the Easter family a series of sadistic blows, be it a terminal illness, a pyromaniac neighbour or a perpetually unfinished extension, Harvey looks on the positive side. It's pathological with him.
The way Jax sees it, instead of dealing with the problems of their marriage and the two kids - restless, difficult, fickle, hypochondriac junior would-be junkie/terrorist Robbie, 16, and street-talking, ambitionless, hip-hop soon-to-be-ex-sixth-former Charlie, 17 - Harvey's optimism ("it'll be fine") is actually his way of avoiding engagement with the big issues.
His days as assistant sales manager at a Ringfence-Upon-Thames piano shop called Old Joanna's Pianos must surely be numbered, his extension doesn't have a roof or a side wall, and - although he doesn't yet know it - Jax is dangerously close to taking her flirtatious relationship with the builder, Rakesh, to the next stage.
Mr Blue Sky is about one man battling to remain positive when he's been dealt such a poor hand in life, and one woman battling to live with someone who has his head in the clouds.
In this episode Robbie, whilst in search of a stigma, bites off more than he can chew whilst Harvey makes the most of a beautiful day and walks to work - what could possibly go wrong?
Harvey Easter .... Mark Benton
Jacqui Easter ..... Rebecca Front
Charlie Easter .... Antonia Campbell-Hughes
Robbie Easter .... Joe Tracini
Rakesh Rathi .... Navin Chowdhry
Kill-R .... Javone Prince
Ray .... Justin Edwards
Sean .... Michael Legge
Writer ..... Andrew Collins
Title Music performer/arranger ..... Jim Bob
Producer/Director ..... Anna Madley
An Avalon production for BBC Radio 4.