Cheaper here.

and not available until 26th March. this one if ordered before 8pm will be delivered tomorrow.

Looks like this is the 2GB single sim version not the dual sim 3GB version which is £10.00 dearer from Amazon.
GENERAL GSM
HSDPA
LTE
PHYSICAL 144.3 x 73 x 9.5 mm
OS Android, Android OS, v7.0
DISPLAY 5.0 inches (~65.4% screen-to-body ratio),
PROCESSOR Qualcomm MSM8937 Snapdragon 43, Octa-core 1.4 GHz Cortex-A53
INTERNAL MEMORY 16GB
EXTERNAL MEMORY 2GB RAM
DATA SPEED HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps
BROWSER HTML5
EMAIL App/Push
MESSAGING App/SMS/MMS
APP STORE Google Play Store
CONNECTIVITY Wi-Fi
CAMERA 13 mega pixel (Geo-tagging, touch focus, face detection, panorama)
FRONT CAMERA 5 mega pixel ()
BATTERY Removable Li-Ion 2800 mAh battery
TALK TIME
STANDBY TIME
VIDEO [email protected]
MUSIC Yes
RADIO Yes
GPS Yes
JAVA YES

Yes I think MPD have got the wrong information in their initial description. The 3GB version is exclusive to Amazon.

no its the 3gb read description on link. quote...
The G series is without a doubt the most popular of all the Motorola Smartphones on the market, and it's clear to see why in their latest Moto G5. The G5 is a reliable, easy to use Smartphone which gives users an all-round great experience of Android. Browse the internet and social media on 4G while enjoying a variety of apps thanks to the Snapdragon 430 processor. There's also 3GB of Ram and 16GB of internal storage which can be expanded up to 256GB via a MicroSD Card. The 13MP camera is upgraded to a much crisper image than previous models and has more advanced options in within the photo app. This is most apparent on the front-facing 5MP camera which allows you to take the perfect selfie. The 5.0-inch display is the perfect size, slight more compact than last year's 5.5", so you can enjoy online video content or watch back your recorded HD videos in 1080 x 1920 pixel quality

no its not. just amazon bull.

​where did you get these specs from????????