Well I am on a roll now!
Argos do not have the LG 58UH635V in stock at £669.00.
Feeling deflated I perused other stockists and came across a pop-up on the John Lewis site stating that they were going to price match anything that they stock against other retailers TODAY only!
I was dubious but telephoned and to my surprise, they price matched without discussion.
I also got 5 year guarantee plus free delivery as standard (chose to collect due to potential BF delivery delays).
Check it out now!