Yes for 30 days (y)
https://www.screwfix.com/p/masterplug-weatherproof-box-kit/46169 Yes for £19.99. The extension lead is only 6 metres but the RCD is essential if your main fusebox doesn'have one
Picked up this for £15 yesterday from Asda Didn't need the timer as using smart plugs inside the box https://groceries.asda.com/product/extension-leads-cables/masterplug-weatherproof-outdoor-power-box/1000001094078
Plus collecting locally also means it's easier to return if there are problems, and with christmas coming up, even prime doesn't necessarily mean next day delivery. I've had that problem a couple of times over teh years, so I rarely use prime nowadays.
Will Amazon provide prime membership for free ??.