Ether in a Wallet contract how do I get it out.

A few years ago I sent Ether to a Wallet contract. It was an already made contract. In the contract it mentions Gav Wood. I think I sent Ether there to “park it”

On looking at one of my old addresses I noticed that Ether had been sent to the contract address. The “contract creator” is myself according to Etherscan address linked to it.

How do I extract the Ether back to the creator address?

As far as I can remember this was a simple thing back then. I’ve unfortunately missed this on my messy desk.