Just thought I'd provide an update (not that many care now its Monday) but I'm very happy with the service from mobiles.co.uk! I upgraded through them on the 15th September to an iPhone 6S+ 64GB Space Grey and was quoted a 3rd October delivery date, despite places like Apple and O2 having 3-4 week quotes, I was late with my preorder because I had decided to cancel my O2 order for my 6S because I decided I wanted a bigger screen and mobiles.co.uk had better upgrade deals (although I miss out on O2 refresh but hey ho).
As launch day came I was missing out on all the fun but knew I only had a week to wait and that it was no one else's fault but myself for being indecisive! However this evening at around 7:30pm I got a text from O2 saying my tariff had been successfully changed, confused, I checked my email to find that it had been dispatched and would be delivered by DPD between 8:30am and 12pm with a 1 hour delivery slot being sent to me in the morning! Very impressed that it's coming so early, especially after I ordered so late and its a model that is considerably difficult to come across!
Also means I don't have to go without a phone as mine was due to be sent off to envirofone tomorrow, leaving me with a crappy backup phone for a few days, but not anymore! I definitely recommend mobiles.co.uk if you're looking to take out a contract or upgrade (they're owned by Dixons Carphone if anyone was wondering, confused as to why they haven't merged them with Carphone Warehouse tbh?)
Get £15 off your upfront fee with UPGRADE15 at checkout in case anyone was thinking of using them! 😛