(31 Aug 2016, 3:36 pm)Dan wrote Solos 681, 682, 683, 684, 685 and 688 were all delivered to Go North East today. Of these, 685 has already received "indiGo" branding. 682 is pictured below:
Go North East: 0682 / NK66CWX by Daniel Graham, on Flickr
Is 681 NK66 CWU and 688 NK66 CXD? The others were easy to work out using 682 and 685 (given there are only 2 letters of the alphabet left after X).