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Ill get a photo for you when I get home, but I used this (it was the strongest/ least medical looking version I could see)
https://www.amazon.co.uk/gp/aw/d/B01MT7NA7BThe window frame is 125 x 225cm and the pole is as high /deep in the frame as it can be (to block light and allow the window to open under it). Not the most beautiful thing ever, but pretty un-noticable as we keep the outter curtians half drawn at this time of year anyway to keep the room cool.
Our house is south facing, so I was being woken up at 5am with the light streaming in, despite having blackout curtians.
Our current window opens in so there was no point in putting an in-set blind, as it would block the window opening.
We will replace the window eventually and once we have I'll probably will get a blind... but until then;
we fixed it yesterday by getting a extender/spring curtian rail, and a single blackout curtian then putting it within the window frame/ internal recess itself, tight up to the window at the top. It stops the light leaking through and and round, came in sub £50 all in.
We only need it in the summer months, so its handy to be able to take down. I imagine the extra insulation will be handy if we have another run of 40c+ days this year.