Does anyone know how well "Creocote" protects wood from UV degradation?

I've made a pair of external gates using T&G, and 4x2. I have treated every
piece of timber with "Creocote" (oil-based creosote substitute) prior to
assembly. I dare say this will inhibit rot, but I've since read that
sunlight, primarily through the action of ultraviolet light, degrades wood
through the creation of free radicals which then degrade the wood polymers.
We've all seen wood that has turned grey and shrunken after prolonged,
unprotected exposure to sunlight.

Perhaps I should paint the gates as soon as the Crecote is thoroughly dry.
If so, what paint would be most suitable?

TIA

Jaked D