I know a fair few of you have had good results with cordless impact wrenches on the rear wheel nut. Screwfix are doing a deal on a Makita wrench for £60, though it's body only. I don't have one, so not recommending; just thought I'd pass it on. Same wrench on Amazon is £130.
Will probs need to go a couple of models up the food chain from that one, as it will barely open a bottle of pop. Nice price reduction otherwise though.
