Well, so far Airfix don't appear to have bothered to revisit this classic aircraft in 1/72, given they've re-released the red, black and green 'ones' in the last couple of years.
Hungarian company S.B.S Model has pulled it's finger out and produced a couple of half decent looking DH.88s in resin. I can't vouch for accuracy, but all the resin sub-assemblies appear to be complete and of good quality. I think I'd bin my Airfix kits based on this offering. Not cheap though as they go for €40 each (around AUD$56). BNA Modelworld is a local supplier for S.B.S Model and there are many other reputable mail order suppliers who carry their stock. I've purchased some resin seats in the past and they don't look shabby.
http://www.hyperscale.com/2015/reviews/ ... ewbg_1.htm
(plenty of photos here)
http://www.sbsmodel.com/resinsets
(scroll down the page to find the DH.88)