Replacing existing 30 year old double glazing - worth it?

as an aside i bought a d/g window 610x 965 with a top opener from crystal ordered via robert dyas
' emailed them direct and asked them iff it could be without the trickle vent explained is was for a shed and would be on its side and they supplied without trickle vent
they also made sure i was aware that the weep holes would need replicating, so excellent service
 
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