Why do you have to clear Immigration? I had no intention of going landside. "Gatwick Connections" offer self connecting with hold baggage transfer to the following Airlines:
Aer Lingus
Air Europa
British Airways
easyJet
Flybe
Meridiana
Monarch
Norwegian
TAP
Thomas Cook
Virgin Atlantic
WestJet
WOW Air
Come on DUBHUB (and FR), think of the extra revenue.