wood windows

Hi chaps been looking for new beading which for some reason finding tricky for my wooden window frames, fitted new glass but old beading needs replacing, looked at pvc and I know I would need to stick it down as oppose to nailing the wood beads, but would it be ok to fit the pvc beading...

As the title, we have moved to a house, like the wood frames. The double glazed units seem ok (1 or 2 need replacing), if a little thin compared to modern ones. We are getting lots and lots of condensation, pools of it on the windows. (See the photos) Would you put Trickle vents in? If so is...