Thought it was a good price for a xiaomi handset. Yes it's from China, yes it's from gearbest, and no it doesn't have band 20 sam_of_london! You could get a customs charge (you will if you select priority) but my experience has been that you won't. I've had many things off gearbest and any issues have always been sorted.
This is the international ROM version, so will receive OTA updates. Only has 2gb ram however this should be enough for most people.
Xiaomi Redmi 4A 5.0 inch 4G Smartphone MIUI 8 Snapdragon 425 Quad Core 1.4GHz 2GB RAM 16GB ROM 5MP+13MP Cameras Bluetooth 4.1 Infrared Gyroscope WiFi Direct
Display: 5.0 inch, 1280 x 720 pixels HD screen, 296PPI
CPU: Snapdragon 425 Quad Core Max 1.4GHz
System: MIUI 8
RAM + ROM: 2GB RAM + 16GB ROM
Camera: 13.0MP rear camera + 5.0MP front camera
Sensor: Gravity Sensor, Gyroscope, Infrared sensors
SIM Card: dual SIM dual standby, Nano SIM / Micro SIM / Micro SD card
Feature: GPS, A-GPS, GLONASS, Beidou
Bluetooth: 4.1, Bluetooth HID