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I'm the last person to complain about other people making mistakes, or giving out dodgy information.

If you've - er - enjoyed my reports on TV, radio or online over the years you'll know that I've had more than my fair share of them.

I once missed the start of my own programme, by lingering too long over a last-minute script change.

I also forgot the name of a guest while introducing him at the start of a live interview, and had to ask him to remind me who he was and why I was talking to him.

I laugh about it now (in a high-pitched, nervous way) but at the time it was taken very seriously. Rightly so.

We don't like mistakes, and we do everything in our power to prevent them.

Our aim is always to bring you relevant information that correct every time. Even though we all face deadlines, we value accuracy over speed. That's as it should be.

But sometimes errors are made - both by us, and by the people we ask for information. When we do get it wrong, it's important we put it right quickly, and with an appropriate sense of apology.

So - here goes.

We brought you a report yesterday on the cost of calling government helplines if you've only got a mobile phone.

These are helplines that you would call when you need to make your first claim for unemployment benefit if you lose your job, or if you're a parent tracking down your child benefit that's been cancelled by an administrative blunder, or if you need to apply for a crisis loan if you find yourself in a financial emergency.

But the very helplines that are meant to assist you could end up making your money troubles worse, if you call from a mobile.

Those 0845 and 0800 numbers could cost you for every minute you're on the line. If you're put on hold this could add up as the minutes soon whizz by.

Why would you ever call these numbers from a mobile? Well, according to Ofcom, in 2008 11% of households didn't have a landline at all - they only had mobile phones.

If you're strapped for cash and need to make the choice between one and the other, many opt for the mobile phone instead. It's more useful and practical.

Telling you this story is one thing.

But you've told us you also want practical advice. Tips that make life cheaper or easier. So we compiled a few, including the very obvious point that it's much cheaper to call these numbers from a fixed landline than from a mobile.

That is true.

But how much cheaper?

We went straight to BT to ask. It referred us to an old news announcement which proclaimed that "BT had offered ... cheer to 14 million customers by becoming the first UK telephone company to make calls to 0870 and 0845 numbers free."

That looked fairly straight up-and-down to us, so we broadcast that as part of our report.

Unfortunately it's not quite true - as a flood of emails from you pointed out. Many of you have been charged for calls from your BT phone to these very numbers.

That's because they're not "free" for everyone.

What BT has done is include these numbers in its existing call packages.

So if you're on a deal that gives you free calls anytime, your calls to 0845 and 0870 numbers are free, any time of the day or night.

But if you are on a deal that only gives you free calls at evenings and weekends, then 0845 and 0870 numbers will only be free at evenings and weekends too.

And if your calling package is for free calls at weekends only, then 0845 and 0870 calls will only be free at weekends.

To be fair to BT, even though their headline and the first part of the news announcement proclaimed "free" calls, the detail showing they were not exactly free was in the later paragraphs.

So - we're sorry to have confused you. And we're grateful to you for pointing our mistake out so quickly.