I'm up in the North East and still on 'not despatched yet' from Amazon. I've got Prime though so will be getting a courier delivery, just a bit frustrating to see it might have been better off going through regular First Class postage.
On my ride into Sunderland today I saw like half a dozen ads on boards, don't usually see them for games round here, mostly just films!
The key word there is 'Might'. With courier you are guaranteed release day. With first class, there is a chance it may work out better, but equally there is a chance it may work out worse.
As I mentioned, Royal Mail's reliability is exactly the reason Amazon send those one's out earlier. To try and and ensure a higher percentage actually make it on time.
Take comfort in the knowledge that while you may not receive it early, you absolutely won't receive it late.