Xander has progressed to no trainer wheels.
A few months ago we were given our neighbours old bike for Esmee but it is a bit big, so instead we converted it to a 'balance' bike and took off the trainer wheels and pedals and Xander has been riding around on that. Esmee is still too little for it but we hope to get her a bike soon.
Today we took off the trainer wheels on Xander's bike and he had a go.
A few more days or weeks (depends on dedication and time!) and he will be on his own.