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seems they were popular but no longer made.
https://www.aluminiumtradesupply.co.uk/12367/monarch-patio-doors-glass/i would do a bit of googling and look at the profile PDF's and see how wide the glazing units can be, how slim and U-values.
Been quoted by the local glass company £2,690 for a set of 2.1m by 2.1m aluminum sliding doors and £2,400 for the UPVC version.
He seemed to want to push me towards UPVC and French doors as it would supposedly have better seal and thermic properties but I think sliding will work better for the location/use case and aluminum will last longer.
They said they use Monarch as the manufacturer. Any thoughts/feedback on this? It's supply and install and sounds quite good to me. Builder will make opening and re-render the back of the extension separately.