I too have had one very similar in the past few days. We suspened the claim and asked for details of both partners income etc with a view to superceeding the claim. Needless to say claimant denied the presence of the partner.
Intitally I thoguth of waiting untill the DWP dispute had been resolved, and then due to advice in another thread was going to submit my own submission to TTS.
However, due to the evidence we had, it turned out that we did not actually agree with the ltahaw decsion, do we have decided to award benefit with her as a single person, but made it quite clear to her and the rep that the DWP will amke their own mind up and the decsion may well be different!!!!