Well, all credit where credit is due, I had a call from Charlie today who is the Sales Manager at Milltek after further action from the very persistent Sarah She really is brilliant!!
Anyway, to cut a long story short, a replacement back box and mid section are being UPS'd from Milltek tomorrow direct to Abbey who will replace the offending item By the way, the droning has started to appear even quicker than before and a slight metallic rattle has now become evident when revving the engine at standstill.
Further update to follow next week hopefully