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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.
Mr_Smyth
Do you have the details of other steel window manufacturers?