Matt, I'd only be guessing on the first one. There are a lot of similar hybrids, many of them made by Hummel (see link). I'm not seeing an obvious match, but I'm wondering if the berries on your plant may have started out red and white and then aged to solid red? An older inflorescence can be misleading in its coloration, and bracts that once were prominent can shrivel and fade, making it harder to ID. It may be someone else's cross too.

The last one is very stretched, but it does look like fosteriana to me. I see what you mean about the dark bracts, but look at the first photo for that species on FCBS. The bracts are fairly dark on that one too, so I suspect that trait may be somewhat variable.

Ae. Malva is a cultivar of mulfordii, but whether yours is the same clone I'm not sure.

Here is a link that might be useful: FCBS search results - Aechmeas - Hummel hybrids

Hi Matt ,the only one i can help you with is the Ae fosteriana wich indeed it is ,some clones do have redder bracts and some are more brown ,but that occurs in many species ( variability ) as Lisa has stated before ,nature is not a cookie cutter , sorry but have no idea about the other 2 ,
Jack

Lisa and Jack, thank you both for your responses.

Lisa as these plants aren't in my garden i'm not exactly sure how old the flower spike is. I hadn't considered the age factor for older inflorescence and loss of white for the first one.

And yes that makes a good point again for the last one which you both pointed out.

Hi Matt,

Sorry it's taken so long to get back to you but I've been having trouble signing on for the last two days.

If that bit of purple leaf poking out the bottom of the first pic. belongs to that plant, I would say it's Ae 'Big Stuff'.

My plant has concoloured leaves and the berries are just starting to die off now after being a show of colour for months. It's also a very reliable flowerer and a good grower down here and likes a bit more shade than my other aechmeas.

All the best, Nev.