Today some of the track I ordered arrived and I was able to test the loco and am pleased to say that it all works OK and the slow running is excellent.
As an aside the track that arrived was Peco's ST U750 and ST U751 (both as rare as rocking horse ****) both work on DC control very well with excellent slow running across the full length of the points in al routes with no hesitation.
If I had realised O gauge was so much fun I wouldn't have spent so much time and money on the treble O, N and OO gauges layouts I have previously owned