Ok, so this requires a long phone call with Curry's but essentially their price match offers to beat a competitor + 10% of the difference. If you call them and state that Comet advertise this for £19.99, they will beat the deal. They originally told me that they would match including postage, i.e. £25.14, but I refered them back to point five of their price promise and they have honoured it, therefore costing me £18.89 delivered.
Worth a go whilst the policy remains unchanged! (Bet this gets updated overnight!)