Ok this is no way Spoilers, it's just what I think is gunna happen:
Colonel Telford is gunna have sex with Colonel Young's wife having her believe that he is Colonel Young, and in a few episodes time she is going to discover that she's pregnant! She won't know from which encounter but either way, it's Telford's baby because it's his body! Like I said, not Spoilers, just my opinion
Oh and Colonel Young will discover what Telford did (having sex with his wife).