Tim S wrote:

We need to replace some doors (changing 2 to sliding and the 3rd door is a
bit knackered) and the choice is for unpainted wood.

If you're converting to sliding have a look for "Scrigno" (pronounced
"screen-ee-oh") door frames. They're much higher quality that the
rubbish previously sold in the UK. We have several doors of this type
and I was surprised when I saw the stuff installed by a British builder
which was wobbly and incredibly ugly by comparison.

I thought that Scrigno (and the competitor Eclisse) weren't available in
the UK but a web search shows that they are both sold here. The big
advantage (IMO) is that they are designed to take a standard door and
turn it into a sliding door. Also there's no floor track to worry about,
but despite that the door doesn't wobble on the track.