Does it freeze where you are?

Yes, it does. Are you going to rec. shut off valves? Cold ha! I'm in London, Canada. It gets bloody cold.

Installing an outdoor shower shouldn't be difficult. Have you thought about where the shower water will drain. There may or may not be restrictions on draining grey water in your locality. Some places will allow you to just drain grey water to the garden, others will require that you tie into the sanitary sewer or septic system. Your local planning department can advise you.

In addition to shut-off valves, you'll also need a way to drain any lines that will be exposed to freezing temperatures during your very cold London winters. Even though you turn off the water supply, any water trapped in the pipes between the shut-off valves and the showerhead will freeze, and most likely, rupture your pipes. You'll need bleed valves at the lowest point in the lines beyond the shut-off valves to drain off any water left in the pipes.

I was born in Ontario but only moved to BC after living in Australia for many years, where outdoor showers are common and popular, especially in the beachside suburbs.

Since I doubt you'll be lathering up and doing your hair, I wouldn't think grey water's going to be an issue. If you're going to use it frequently, I'd recommend you put down some sort of pavers, with a fall away from the house.

Personally, I'd recommend a setup where the thing's connected to a garden hose tap, you could always use one of those triple or double adapters, so you can still use the hose. The advantage of this is you will be able to drain it completely, by disconnecting it from the hose - I guess you'd need a section of hose to go from the pipe to the tap thing. You could use a flaring tool on the end of the copper pipe, to where you slip the section of hose on, and secure it with a hose clamp.

If you don't mind how it looks, you could run it through some black water pipe, alkathene was one of the names, so you can get some solar heating if you want it warmed a little....

You could of course plumb it in but you'll need a bleed valve etc and it will be more complicated, with more risk of freezing, which is why I recommend some method of complete disconnection and complete draining.

Thanks guys. PJB, you are either brilliant or I am very stupid. Either way, thanks. Why did I have to make it so complicated??? That was just too simple, I'm surprised you even responded.LOL. Thanks.