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					Originally Posted by Stephen  Oh my. Not been excited for a Christmas episode ijn years. That looks utterly fantastic. 
 Bill is back and I am sure that was meant to be Captain Lethbridge-Stewart.
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 Maybe a push for the father of the Brigadier with some tweaks but I think that's unlikely. The uniform fits the period of the WW1 setting. The period of which Alistair Lethbridge-Stewart wasn't alive. That made me consider his father which upon digging a little revealed that back story only led to his father being a WW2 pilot but offered no other information. The captain looks in his 40's, he didnt then father a kid in the late 1920's, he's more likely to have kids at the present time. Noting the echo hint that surely leaves it at the grandfather. 
I eliminated time travel via the uniform of course. Unless he dressed for the occasion before randomly appearing in the middle of a world war.