If you mean extendabike (single rear wheel with child saddle, pedals & chain) you can get from Bicycle Workshop in All Saints Rd W11. You can buy elsewhere but this shop really knows about them. I have one (Adams brandname) & it works really well. Costs about 100 quid but is well worth it. Kids love them! Bike Workshop will also tell you if they know anyone trying to sell one. Make sure you get lights, reflector & mudguard too.
Rob Cope ● 5913d