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When I make a mistake on the programme, I want to admit it as soon as I'm aware of it.

It doesn't excuse the error, and doesn't change the fact that I should have been right first time. But owning up to it, and saying I'm sorry for it, is the very least I can do.

So thank you to WL viewer Michael Taylor for spotting my howler in today's stock market report - and emailing me about it immediately.

I was talking about the supermarket Morrison. It had a good Christmas, thanks to our love of party food. Sales of some canapés have almost doubled. Champagne sales were boosted by special offers.

So far, so good.

Then we got to the nitty gritty.

I said Morrison's pre-Christmas sales were 4.3 per cent higher than the same time the previous year.

I then compared that with Sainsbury - which saw its holiday sales rise by 4.2 per cent - and Tesco, which had a sales increase of 4.9 per cent.

If you were watching at home, the obvious inference is that Morrison did better than Sainsbury, but not as well as Tesco.

(That is, by the bye, a perfectly respectable place to be in - and a whole lot healthier than Morrison's perilous state just a few years ago. The turn around in its business has been remarkable.)

Just one problem ...

Morrison's per-Christmas sales were actually up by 6.5 per cent. I had, by mistake, written in a sales increase recorded by the company earlier in the year.

It's a very silly, and very a stupid, mistake and I am correctly ashamed. I'm sorry to you for giving you the wrong information. You deserved better.

And I'm sorry to the thousands of Morrison's employees who worked so hard in the run-up to Christmas to serve their customers and deliver this sales increase. I wouldn't want to undermine their achievement or their efforts.

One other thing I said was that the City had expected more. That much remains correct. The city's analysts saw Waitrose's champagne-popping sales figures earlier this month, and other research which suggested we'd splashed out on treats and better-quality fresh food this Christmas - and had hoped for a larger rise in sales than Morrison's delivered.

That's why its share price slipped today.

You may choose to file that away in the "some people are never happy" folder.

Meanwhile, I'm going to stand in the naughty corner for a bit longer. Well, until Naga lets me out again.