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I assume your tails are finishing with an isolation valve so olives might be necessary.
Inserts aren't needed when using copper pipe - only on plastic pipe.
It would be my choice to use copper everywhere except for flexible tap connectors (unless the side of the basin was in view in which case I'd prefer to bend the pipe and hide all the pipework behind the pedestal.) I use copper pipe for showers as it provides strength and, therefore, less likely to move when the shower is in use.

You can get the wc functioning by attaching a pan connector to it and the soil pipe then leaving a bucket next to it. Not brilliant but it works and takes about 1/2 hour to arrange.

With the bath, you can fit the trap and taps, fit the legs and put into place fitting the pipework temporarily. This should take around 1/2 day.

And arrange a plumber to come out in early January.

I'd like to be more helpful but I'd end up writing a book, to be honest.
 
Sure, totally appreciate an experienced guy could do it quicker and knows all the tricks otherwise everyone would do it themselves.

We are stretching the hospitality of the in-laws (they say we aren't but we've been here a while) so I'd like to get cracking so we can get in there.

Like I say I just want to get the bath, sink and toilet in but don't want to do anything that's going to have to be re-done when I try to finish the rest or get someone in to do it and also don't want water pouring through the ceiling if I can help it.

I think I'll just start a bit at a time and test each bit with isolators/terminations galore to ensure I've got no leaks before moving onto the next thing.

The missus is going back onto the phone tomorrow to see if anyone can help out/fancies a bit of Christmas money so maybe we'll strike lucky.

I've also got Christmas Eve and Christmas Day if it all goes Pete Tong or takes too long plus the father in-law has fitted a downstairs toilet and sink before using push fit and it able to help out.

If I do get hold of someone what's a good price to first fix and install a bath, sink, toilet and non-power shower. I would still do all tiling, bath panel and flooring myself.
 
Instead of using plastic pipe and fittings and worrying about inserts and the security of the works, use copper pushfit fittings such as Cuprofit with copper pipe. No inserts needed, absolutely rock solid (I defy anyone can pull one apart!) and leak free. Screw fix sell them.

You will need to use pipe cutters and debur the edge of the pipe before pushing it into the fitting.
 

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