Possible pitch and treatment?

TREATMENT
Colin is a regular patron at the pub, making it part of his daily routine. He visits every day, and the barmen know he drinks Guinness every day, and even sits at the same table. He sleazes onto the waitresses, and makes people feel uncomfortable with personal questions and inappropriate comments, but he is harmless.
One day he walks into the pub and asks for a glass of Chardonnay, but the barman pours him a Guinness as he ignores Colin’s request. When Colin tells the barman of his mistake, he is again ignored. It is then that Colin realises that he has faded into the background, and is forgotten about. As the days go by, he gets more adventurous in his attempts to get noticed, ranging from streaking in the pub, to stealing a car and everything in-between.
Then one day, the unthinkable happens, and the pub goes up in flames with Colin trapped inside. But nobody realises that he is inside. As the fire spreads, they realise there is someone trapped inside the pub, but no one knows who it is. Eventually someone comes coughing and spluttering through the door, and as they emerge through the smoke, we realise it is not Colin.
Suddenly there comes a yell from an upstairs window, and we see Colin holding a baby, as panic ensues, the fire brigade set up a trampoline to catch Colin and the baby. When instructed to drop the baby onto the trampoline, Colin refuses, saying that it isn’t safe, and with that he heads back into the burning building.
As the minutes go by, the crowd outside get increasingly anxious, with the baby’s mother becoming hysterical. We hear a huge crash emanate from the pub, which is met by a collective gasp from outside. Finally we hear the smash of glass, and another loud bang, and from the back of the pub appears Colin, baby in hand. The pair is instantly surrounded by medics, the parents of the child and other people congratulating Colin.
Months later, Colin returns to the pub after it has been refurbished, and is greeted warmly by the staff, and is asked what he would like to drink. When he receives his drink, Colin does not go to his normal table, but instead sits in the garden, enjoying the scenery and other peoples company.

PITCH
The plight of a seemingly invisible man, and how he tries and fails to gain attention, before becoming a hero.