Thanks FoxOne and 2GodBDGlory.
Might forget steering for now. In the past we've made little buggies with NXT servo motors and the 'intelligent' brick controlled via Bluetooth with a phone app, but as you say, quite cumbersome.
Thanks for this tip and offer of help, although we are quite used to being 'behind the curve' - still using Mindstorm NXT components being an example!
Yes, hoping the book will be a good move away from kits. This grandson made his Vernie robot from his Lego Boost Creative kit last September and still hasn't taken it apart yet.
Are the knock-off ones any good? I assumed they would be rubbish.
Thanks again everybody. Great forum.