Apologies for asking so many questions! It sounds as though it would be reasonable to run a 2d TSO and a 2f version in the same rake. What was the situation with BSOs af far as you're aware? Presumably a 2d version would be more accurate in a rake which already includes 2 2fs (FO and TSO)?
Might I ask, for clarity, whether you're saying that the TSOs were 2d or 2f, please? I have Hornbu 2d TSOs and a BSO, but will I need to replace them with the Bachmann 2f versions for accuracy?
I ordered an LNER example, but, sadly, one of the smokebox door clasps is broken-off, so I'll be emailing tomorrow to arrange a replacement (if there are any left).