@ah184; if you only used We Connect Plus for monitoring your fuel consumption, I wouldn’t bother renewing it.
I’m assuming fuel consumption data for the mk8 Golf can be viewed in the vehicle settings via the infotainment screen (it can in my Polo GTI+). Alternatively, you can calculate it manually when to fill your tank; convert the no. of litres to gallons that it takes to fill the tank and divide the mileage driven since last filling up by the gallons used.
There are also a number of free apps for monitoring fuel usage; do an internet search on ‘best free fuel tracker app’ or similar.