This phone has now dropped below the £100 mark. Good price for a mid-range windows phone.
Available in black or orange from Argos.
Also at Amazon for the same price but black only.

http://www.amazon.co.uk/Microsoft-Lumia-5-Inch-SIM-Free-Smartphone/dp/B00UTYJ9MM

Get up to 30 GB of free OneDrive storage to back up and access your photos and documents on-the-go. This handset comes with the popular Windows 8.1 but can be updated to Windows 10 for free, following its release 29th July 2015.

Mobile phone features:

Get more done with built-in Microsoft Office on the beautiful HD Corning® Gorilla® Glass 3 display.
Edit your Office documents on the go with the 5 inch display, then access them on other devices with the latest version of Office.
Open the box and power on your Lumia 640 to the full range of free Microsoft services built in and ready to go.
Connect to friends and family with Skype, enjoy instant access to your photos and music on OneDrive, and edit files with Microsoft Office from wherever you are. Balancing your work life and personal life just became easier.
Network provider: Sim free.
Windows Windows 8.1 operating system.
Quad-Core Processor.
MP3 player.
Display and camera information:

5 inch screen.
1280 x 720 pixels.
LCD display.
Full HD screen.
8 megapixel camera.
Video capture and playback.
Network and connectivity:

4G network capability.
Micro SIM card.
Wi-Fi connectivity.
Bluetooth.
Memory information:

1024MB/8GB of internal memory.
Type of memory card required: SD.
General information:

Up to 864 hours standby time.
Up to 953 mins talk time.
Size H141.3, W72.2, D8.8mm.
Weight 145g.
EAN: 6438158719798.