Just found this in eBay which should fit the front and rear axle nuts, useful addition to the bikes tool kit
http://www.ebay.co.uk/itm/Laser-5244-Racer-Axle-Wrench-17mm-24mm-/281188502817?hash=item4178240d21
http://www.ebay.co.uk/itm/Laser-5244-Racer-Axle-Wrench-17mm-24mm-/281188502817?hash=item4178240d21