I'd go a touch earlier than 1985. Peugeots are tricky but I think suicide levers started disappearing in the early 80s. but then the printed head badge means it can't be too early.
What I would do is google image search "Peugeot 198x" etc for every possible year and see what comes up. You might get lucky and find an identical model but otherwise, suicide levers, non aero brakes, printed head tube badge, the front and rear mechs and chainset will all help to narrow it down.
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Focus Cayo Expert (road)
Giant ATX 970 (full susp)
Trek Alpha 4300 (hardtail)
Peugeot 525 Comp (road - turbo trainer duties)
What I would do is google image search "Peugeot 198x" etc for every possible year and see what comes up. You might get lucky and find an identical model but otherwise, suicide levers, non aero brakes, printed head tube badge, the front and rear mechs and chainset will all help to narrow it down.
Challenge PH9 from 1983
This site is also useful http://cyclespeugeot.com/ModelID.html
Not a classic bike - cheap components and gas pipe tubing. £20 seems fair.
That isn't my old one as I hit a dog and bent the forks, which were replaced with chrome ones! Also it was smaller.