They then go on to advise removing the tax disc as well.

“Crime reduction officer Pete Tyrrel, of Spalding Police, is warning people not to leave their keys in the car – even if it’s just for a minute or two.
He said: “People have lost their keys and then a couple of weeks later their car is taken.
“Don’t leave anything in the car that thieves might want, such as sat navs, handbags, wallets, tax discs and CDs.”

Now, as I understand it, it is a legal requirement to display a current tax disc on the windscreen of all vehicles.

Are Spalding Police advising motorists to break the law in order to thwart the law breakers?

Warning issued after spate of vehicle thefts – Spalding Today