Enfield L1A1 on a Lithgow cut receiver??

[desperatedan]

It's difficult to be precise from that photograph but it looks like the serial on the upper begins UE80.... but hadn't Enfield stopped production of their own new L1A1s by the late 1970s?

So could it be that it's a Lithgow supplied upper but used by RSAF and so numbered accordingly by Enfield. I thought I'd read somewhere that the UK had to buy in Lithgow made rifles/parts in the 80's as RSAF had ceased production (plus Parker Hale making barrels and other parts at that time as well)?