This is an opportunity to buy an absolutely first class dishwasher for a very low price of £410. The previous model to this, the G4920, won the Which? Best Buy.
Our last Miele dishwasher was excellent and lasted 16 years in a family of five, on twice per day during the week and three times per day at the weekend.
To get this price you need to use the code 40BILKA to reduce the price to £460.
There is a £50 rebate promotion from Miele here:https://www.miele.co.uk/domestic/cashback-g-4920-2805.htm#p3246
So the final cost is £410 which is a very good price indeed. You could try to get a price match from other retailers like John Lewis or Co-op Electrical. The Co-op is a good bet because they only charge £90 to extend the warranty to five years. I just bought virtually the same model but with the five year guarantee (it has SC in the product code but doesn't qualify for the £50 promotion) for £540 from another retailer and thought that was a very good deal. But if Co-op will price match Currys, you can buy this for only £500 with a five year warranty. That said, Miele are so solid, you're probably okay without for £410. With the uncertainty around Brexit, German goods are probably going up in price.
I thought I'd add that you can buy the Miele 6000 series for two hundred quid more which have smartphone control and a self-opening door. I wouldn't do this given that these developments are new, I've seen the price of Miele parts and labour and I don't need to control my dishwasher from my phone. Buy the proven bulletproof machine. You don't want a £400 bill because the WiFi card in your dishwasher has failed.
There is also about another 2% cashback available from the usual suspects for further saving of £8 or so.