we’ve sourced something now but I like your way of thinkingBuy the right cheap bike for around £100, give it a cursory once over and give it your mate. Sleep well at night as they do f'all to maintain it, leaves it out in the rain etc.
Even better, buy the right cheap bike - get your mate to take it to the local bike shop for a once over. That way you are not on the hook for repairs, complaints about punctures/gear shifts/brakes etc forever more and they understand that bike maintenance costs time and money.
If they pleasantly surprise by looking after it, cherishing it etc - then offer to teach them to do a full restoration or help them find a better bike.
hi enc , I have been there , We would do anything for our best mates but you won't be helping him. so help him to find a decent bike within his budget . Then try to teach him how to maintain it. If at the end of the day he does not live up to it , it is not on you and your mate wont feel he has been let down and more than that he won't feel he has let you down either,help him to help himself. If you do it all ,the work you put in will not be worth snything to him as he has invested nothing of himself in the project.I've been on a few ride-outs with a mate who has a Scott hybrid and he's developed a liking for retro Konas. He knows zero about bikes so the restoration and careful maintenance a retro bike requires is highly unlikely (by him). He's asked me to find and restore something for him with a budget of £300 max. With prices of early Konas stable it's possible we can do this but, an issue for me is restoring a bike I know for a fact will not receive the future care it requires. I'd be pissed seeing it treated the same way he treats the Scott hybrid BUT.... it scratches an itch for me. Currently, I have nine bikes... five ridable and four leisurely build projects ... I really enjoy the restoration, build, cleaning, etc though I daren't take on any more for myself... id be quite happy to restore something for my mate but as I said id be cut up if it wasn't looked after properly. Opinions?