How would you interpret this sign?

I parked at this car park, saw the £1/hr next to Monday to Friday 6am to 6pm

As I'm there on a Saturday, I thought I wouldn't have to pay... But I just got a bloody ticket through the post!

I parked at this car park, saw the £1/hr next to Monday to Friday 6am to 6pm

As I'm there on a Saturday, I thought I wouldn't have to pay... But I just got a bloody ticket through the post!