I've enlisted spies from the Lynn News editorial team (going under the codenames Slack Alice, Apricot Lil and Everard) to report back on town centre shops failing to SHUT THAT DOOR.

Ooh, the waste that's going on 'ere. Skip along Lynn High Street any day of the week and you'll see and feel what I mean. You'll be wafted by blasts of dry heat as blowers send hot air straight out of open shop doorways and into the street.

It's becoming more typical now for stores to attempt to encourage shoppers in by having all their doors wide open – whatever the freezing temperature outside.

It's as mad as burning a patio heater. And the offending businesses really ought to be setting a better example given the escalating cost of energy, oil running out, irreversible global warming round the corner and climate change happening now.

Shoppers need to be given credit for having intelligence enough to reason that if the hour is reasonable and the lights are on, shops are at home to customers.

I was in one of the offending Lynn High Street stores on Saturday when an assistant complained about a draught and being cold.

I pointed out that the doors were wide open and she said she'd love to shut them if she could, but was not allowed to.

Some stores don't have ridiculous open-doors-at-all-times policies.

Boots and WH Smith are two which manage to keep the heat in and still attract customers. They also have automatic doors for those laden down with shopping, without a free hand to open the door.

There's no science I am aware of which says hot air, mostly generated close to the open entrances, will stay indoors. And the evidence of my own experience proves indeed it does not.

Open doors are an outrageous waste of finite fuel resources and, in the same way that we are all now urged to insulate, use low-energy lighting, economise, be greener and turn thermostats down a degree or two we must also be urged to SHUT THAT DOOR.

It's my aim to name and shame persistent offenders, beginning with a couple of examples printed in the Lynn News today (Tuesday).

Send your shut that door nominations to me at: Shut That Door, Purfleet, Lynn News, Limes House, Purfleet Street, King's Lynn, PE30 1HL, or email to purfleet@lynnnews.co.uk