Orchids really don't need potting mix at all. They are epiphytes. Take a look at my orchid blog (I think it's my first blog in my archives). Many grow naturally up in the tree tops nestled in the crotch of taller trees. Orchids also do photosynthesis through their roots which explains the clear pots. No, they really don't need the pot either. The garden centers need to make money off of them somehow - it's all marketing. You can just wire them to a piece of wood and call it done.

This might be useful

https://www.orchid.org.uk/orchidpotting.htm

Thank you both! Do I have to keep the whole large collection of aerial roots? It looks as though its trying to climb out of the pot? The longest is about 12"

I can't answer that Steragram, sorry... I am not a lover of orchids and don't have any experience with them. Some of the flowers are quite pretty (though I find some repellent) but I cannot bear all those roots...

Also they don't look real do they, and they stay the same for seeks on end.

Personally, I love the roots. I think it makes the plant look absolutely wild and they contrast beautifully with the delicate flowers.

A few are OK but these are a bit OTT. I'll see what it looks like after removing the obviously old ones. I still haven't located a supplier of small sachets of orchid compost and I don't want to get a large bag that I'll never use more than a few spoonfuls of...