Are my tyres legal?

I'm supposed to be going to a car show today so I was doing a walkaround of my car and noticed that the front tyres are worn. I'm terrified of getting pulled over and getting 6 points. Looks like I've been going round roundabouts too fast.

The law states something like 75% of the tyre needs to have 1.6mm tread. My tyres have 4.6mm tread along the centres and inside edges but the outside edges are down to the indicators:







Obviously if the tyres are illegal I'll be leaving the ar at home...

Thanks.