Is it bad not to have a signed/countersigned copy of a contract?

[ginjar]

Hi,

I have recently finished a project for a client.

I don't have a countersigned copy of the contract from the agency. This is not ideal but should I be worried? The commercial reality of the situation is obvious from our email exchanges. I am being contracted to perform...

[Cliphead]

I took a drive down to Hadrian's Wall country today and on the M6 noticed signs every few hundred yards like

M6
A
598.7

Can't figure out what they mean and googling isn't producing any answers, can anybody enlighten me?