British people were told yesterday that the personal data of nearly half the nation has “gone missing”. In the newly merged department of Inland Revenue and Customs, a “junior official” downloaded the personal details, including bank account data and National Insurance numbers, of 25 million people and placed all of it on two unencrypted CDs.

The official then put the CDs in an envelope and posted it. The package wasn’t even registered so couldn’t be tracked or traced. It’s now officially “lost in the post”.

Alternatively, it may have been stolen to order by organized crime. We have been told, the official is now under guard in a “safe house” to protect him or her against the media, and presumably criminals seeking “to make him an offer he can’t refuse”.

This morning there’s huge panic all over the UK as people wake to find their bank accounts and personal identities compromised in the most dangerous way possible.

Once again we see the perils of allowing a central administration to accumulate vast quantities of information through a system of universal benefits more in tune with the Soviet era than the distributed nature of data in the age of the internet.

What can you do to protect yourself against the kind of scam everyone in the UK is now worried about?

1. Check your bank and credit card statements for the next 5 to 10 years. Criminals can lie low and strike when banks get sloppy again.

2. Change your online banking password, especially if you use family data as a memorable word.

3. Look at your credit report. The information in the Child Benefit Agency records is enough for a criminal to apply for loans, credit cards and even mortgages in your name, as well as other forms of credit such as mobile telephone and catalogue accounts. Your credit report lists all your credit commitments and recent applications for credit, so you can instantly see if someone has been trying to use your ID.

Apart from that, you are at the mercy of Government officials and your bank’s security measures. Ultimately, they must take responsibility for protecting their customer’s data.

Unfortunately, British Government agencies routinely break its own Data Protection Act. The shambles goes on.

It’s emerging that the British tax authority Revenue & Customs believes tens of thousands of buy-to-let landlords are error-prone in their tax returns. So much so that reports have suggested a crackdown by the Revenue.

However, a spokesman responds, “The idea that we’re dragging in hordes of buy-to-let investors to face some medieval inquisition is just so wide of the mark.” They are, he said, worried that many people are confused about the tax regime, and up to 80,000 may be paying the wrong amount.

Letting property carries a much more complex tax calculation than the normal buying and selling of houses. In many cases it may be that investors are not claiming all their allowances and therefore overpaying.

There is a long list of expenses that can be claimed against rental income. The most obvious one is interest on any mortgages used to buy the property. Capital repayments, however, are not covered by this.

Landlords can also claim 10 percent of annual rental for “wear and tear”, effectively depreciation of furnishings, fittings and the fabric of the house. Insurance is also deductible, as are fees paid to managing agents. Legal and accounting fees are included too.

If you sell the property you must pay 40 percent capital gains on the profit, unlike your main residence which is exempt. However, the first £9,200 of profits in any year are free from tax.

If you have owned the property for more than three years, you can save 40 percent on CGT, and there’s further relief if you have lived in the property. One ploy used by canny landlords is to let their own house for six months, while living themselves in a rental property due for sale, thus eliminating CGT altogether.

As with any relationship with the Revenue, it pays to be on top of the detail.