I have for sale here my daughter's iPhone 6s Plus Rose Gold 64gb in Mint condition (due to her yearly upgrade to a 7+) with all accessories including unused headphones, charge lead and plug along with Mint Box. Bought on Oct 31st 2015 from GiffGaff Unlocked (not tied to contract and have receipt for proof of ownership) . Kept in a Ringke Fusion Case (part of the deal) and has had a screen protector since new and which is still attached so no marks etc. As with her previous phones has had very light use with a few calls a day and light browsing due to her been at Uni most of the day.
As you can see from my profile have positive feedback from selling her previous phone last year.
Cash on collection in London area (preferably near a bank so I can have the money checked for authenticity).