What we have learnt from Harry's trip to the UK

This industrial estate in Nottingham was certainly not the glamour of California.

But Prince Harry could not have seemed more at home during his trip back, which was ultimately to see friends. Ever since he left for America, he's stayed in touch privately with community groups that do the vital work of trying to keep young people out of trouble and tackle youth violence.

They have been discreet about his contact, and loyal to him. So now it felt like he was paying them back - with a huge million-pound donation from his own pocket, not from his charitable foundation.

That's particularly interesting because we don't usually get told the amounts royals donate. But also when there's been so much chat about Harry and his money since he left the comfort of the Royal Family.

It also seems to show a firm commitment to the UK that we've not physically seen from him in a while. Is this the half-in, half-out royal life that he always wanted? Other family members don't have a choice, of course.

In London, Prince William was making a similar type of visit to an event in Lambeth focused on what his homelessness initiative, Homewards, is trying to do more specifically for young people. I was once told by a palace insider that Harry would be William's wingman when he became king.

Their ongoing commitment to the same issues shows how much they could still be a powerful team if they could patch things up. As I watched Harry walk out of the recording studios, there was a serious feeling of deja vu.

This had felt so similar to engagements I'd done with him on this very spot in the past, and that is hard to square with what's happened over the last five years. Read more on Sky News:Princes still so far apartHarry talks of sibling 'challenge'Will Harry meet the KIng? We thought he was leaving, but instead, he hopped over a small wall to chat and take photos with the crowd, despite his security team trying to guide him to the car.

Will there be any other unexpected sights over the next two days? We'll have to wait and see..