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Perla and Black Steel Doors came back most competitively for a project I worked on last year.
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Have a look at Fabco. We use them often for work... they are pretty good to work with and relatively good quality for what they are. That said, what they are is thermally unbroken steel frames that heavily rely on mastic for sealing so there's that to consider.
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Yes, the spenny ones were Raynaers.
the UK decent value ones were Aluk Optio and Sheerline, both of these are uk designed/made extrusions and one of them had their own unique way of doing the corner joins. they also do stepped and putty line profiles.aluminiumtradesupply.co.uk is a good source of info, you can go down a research rabbit hole of profile PDF’s and working out who is using who’s profile and charging more.
Edit, smart systems and Origin were others i looked at.
New flat has them, i'm going to have to refurb the inside (outside is about to be done by contractors), thankfully they are galvanised ones from the late 50’s, really wanted to replace them with ‘heritage’ slimline aluminium but the estimates were about 25k for the fancy german stuff and about 12k for the very good uk system (not crittall) but being on the 6th floor and all the reveals needing to be accurately chased to allow for the thicker frames meant it was a non-starter. that and the likelihood of getting permission from Dulwich Estates was slightly above zero.
Contacted a company fitting 10-12mm double glazed units but they told me the windows were the wrong kind of crittall.
There are a few steel window competitors in the U.K. who are probably cheaper than crittall but still not going to be cheap, i would fit aluminium if possible.