Has your Driving Licence expired?

I thought my UK Driving Licence lasted me until I was 70 (and lets ignore how crazy that is for a moment); however, as was pointed out to me today it doesn't! The license seems to say it does but the (new) plastic card, the one with the picture, actually has an expiry date on it. It, like the plans for the bypass running through Arthur Dent's house, could hardly be considered to be obvious:

You have to check out the (very) small print on the back, which tells you that 4b is the expiry date of the licence. The penalty for driving without renewing it is rather nasty!

And, as you might have expected from our stealth tax experts in the Government, there is a charge when you renew it (and you'll have to keep on doing it every 10 years)...