Chris J Dixon wrote:
I have an arbour in the garden which came as a kit of tanalised
timber components.

After several years, the thin roof timbers look as if they would
benefit from more protection against decay.

I don't want to treat the whole structure, or to significantly
change its appearance.

Are there any products available these days which would be of any
use?

grumpy old man
Once upon a time I would have reached for a can of Solignum or
Cuprinol, but these days I guess it is all pastel coloured stuff
that would be safe to drink. /grumpy old man

Chris

You can still buy real "full lead" creosote - google for bird brand