Thanks to grabbit for £7 0ff voucher and jointy for pointing out to me.
I know this has been cheaper but as usual Nintendo seem to have the old problem of lack of stock at christmas. An alternative for those not near an Asda for that deal posted.
Cheapest I could find at present for anywhere with stock, also includes free next day delivery, possible Quidco and 276 Nectar Points.
Just ordered mine anyway