I think you are probably asking for something that can't fit all your specifications.
Your main problem is wanting a computerised 'goto' mount. That would more than swallow up your £200 before you even got a telescope to go with it. The other problem is the complexity of the mount. The simplist is an alt-azimuth mount. A 10 year old will be able to use it 'out of the box'. You could do some lunar and planetary photography with that. However, it is not good for very long exposures.
The alternative is an equatorial mount. They tax some adults, let alone a 10 year old! They need some setting up each time before they are used. A motorised one will follow an object IF correctly aligned. If not correctly aligned you may as well have not bought one. If they are set up then dozens of faint objects may be photographed. Some of your money will pay for the mount, so a smaller telescope.
Take a look at these.
https://www.firstlightoptics.com/beginner-telescopes/celestron-astromaster-130eq-telescope.html The 'MD' version will track an object, and you should be able to use it with a 'web cam' type camera. It is an equatorial, and will require some patient setting up.
https://www.firstlightoptics.com/beginner-telescopes/skywatcher-skyliner-150p-dobsonian.htmlThis is putting all your money into a big telescope. No set up - but no tracking. Very limited photographic opportunities. (the moon - bright planets) Visually you would see a lot of objects with it.
None of these telescopes will automatically move to an object. You have to find them yourself. Personally - I think that is the part of the fun when starting the hobby.
I use an 11" reflector (Celestron CPC 1100) and a 3" refractor, (Sky-Watcher ST80) mounted on an equatorial wedge, housed in a 2.2m Pulsar observatory. I use a ZWO ASI 120MM, ZWO ASI1600MC and Canon 1300D for imaging.