Kids bike for 8 year old (Surbiton KT6)

My little one's bike got nicked from our back garden! Disaster.
Now on the lookout for a replacement. 20 inch would be ideal, but we'd happily take a look at something a little bigger or smaller for the time being -- and then pass on the love if/when the right thing/size turns up.
Bonus points if it is not too boyish or girly -- although we aren't fussy I can't promise that from the small human.