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From what I remember most of the cost was the bi-fold doors - we're fairly sure from memory that the bi-folds were £2.5k ish and the 1.9m x 30cm ish window was £700 but can't find a breakdown anywhere. Would be easy to get a quote from them though.
I forgot that the total figure also included a second full height door out into the side return...
£2k + VAT for a window of that size is definitely pricey.
We used Schüco for the windows and bi-folds in our last place and were very happy with them.
https://www.schueco.com/uk/ (but bought from https://www.bifoldingdoorfactory.co.uk/)
Not as fancy as Maxlight but a lot cheaper and good quality. Two floor to ceiling windows (one very narrow) + floor to ceiling door + bi-folds came to £5k. That was in 2015 mind.