If the switch is faulty for boot release (easy enough to test by pulling it out and shorting the necessary connections) they're available for peanuts new - about 6 euros from Audi in Germany. Not sure what the UK dealer price is?
Could be the actuator in the boot of course. Does the button on the remote fob work to open the boot (need to press and hold for a few seconds)?
Windscreen sounds like a cheap insurance replacement where the previous owner hasn't noticed it didn't even have the top band. It should do and new screens are apparently tricky to do right if you have exacting standards. Mine has been replaced in the past but seems OK
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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