For those who haven't pre-ordered and want one today, I just picked one up from my local Maplin (whereas Currys, PCworld and John Lewis seems to be only available online atm)
Also, Maplin just started offering vouchers with purchases, £5 off voucher when you spend £50 or more or a £15 off voucher when you spend £100:http://www.maplin.co.uk/voucher-offer
So, £114, not a bad price with the voucher... could contribute to a chromecast to compliment the Google Home
NOTE: voucher is for next purchase and is only valid between the 18th April 2017 and 27th April 2017 inclusive.
[UPDATE] possible £15 cashback for new Quidco members. Thanks to Julian_1234
Quidco says this:
"The offer is available to new members from 10:00am 06/04/2017 to 11:59pm 30/04/2017, or until 2,000 redemptions have been claimed on a first come first serve basis..."
[UPDATE2] User northwales mentions this about Google Music free trial is eligible no matter where you buy from:
the 3 months of free Google music is from Google themselves not Curry's. so everyone will get that offer, no matter where you buy from