Found this in Aldi, Great Harwood reduced from £79.99 to £59.99 but it scanned through at £29.99. A good price for just a portable HDD but this offers much more.
Wireless hard drive with shared access - whether at home or on the go.
MEDION® Wi-Fi Hard Drive 1000 GB S88411
Easy access to your data
Li-ion battery (3,300 mAh)
Power bank function
SD card reader
Free app for Android™ and iOS