I absolutely agree that Mr. Gosden may rose-tint things retrospectively, either consciously or unconsciously. We’re all susceptible to that. But regarding electronics, he had devices at home. His parents kindly provided them. That’s one of the few facts we have!Well, the picture Andrew's dad painted is much different from a naive, introverted, lonely child thats repeatedly painted in coverages of this story. Smart, witty, headstrong, open, chatty, sophisticated and well familiar with London, comfortable talking with adults.
Maybe his dad is tragically not wrong at all and Andrew just wanted to have a nice time away from school, check out the store (or whatever) and then went to someone he (or possibly even they knew) to do exactly what he predicted: went to someone he considered as friend and told them that he skipped school and needs a place to "hide" from angry parents for few hours till they get over that trip - letting that person know that nobody knows he got to London.
In that case all that lack of hints, lack of tracks, lack of leads would make sense as there wouldnt be any as nothing particularly important was supposed to happen, in Andrew's mind.
Any clandestine meetings with someone in London is pure speculation and not based on what is known.
LE can - and often do - get things wrong, but their investigation found absolutely no digital communications from Andrew to anyone. There is no indication he was some kind of computer whiz, and as someone who studies digital forensics and writes digital forensics software, I really doubt he’d be able to cover his tracks and not slip up once.
I’m sorry but I don’t quite understand what you wrote about angry parents. Do you think he was just taking a shopping trip? Would you mind explaining that in more detail? Thank you.