For what its worth i've returned 66587 and have just been called to advise me that there are no replacements available so have taken the refund option.
It was wobblier than an anxious jelly and it appeared that at least one wheel set was not in contact with the railhead on my test track which prevented it from running even slightly well.
Additionally, there appeared to be red lights permanently on in the middle of the cab face where there was no light resulting in a reddish glow - I should have taken a picture of it prior to sending it back.
Anyway, I think that on balance, the Hattons project is just not worth the aggro and whilst i'm disappointed as I did love the pink One livery, i'll stick to Bachmann for future 66's. What they lack in fidelity they more than make up for in terms of reliability.
Hey ho....