Bike Forums - Langsett owners

I'm trying to identify a rather nice quality frame I've just bought.
The owner thought it might be a Mercian, and in fairness it's very much like my Mercians, even has a Mercian'esque serial number.
But he said that he was reminded that it was actually a Langsett. Now that's a random one to just come up with. Only thing is I can't find anything on 70's to early 80's Langsetts.
If anyone has one, could they let me know the serial number.
Mines 11078. Bob Jacksons have near identical numbers for the period, as do Mercian, but there's no builder number.
I can't post images just yet as I've not posted my quota.
Thanks