If your L is asking you for docs you dont recognise, then ask them for a generic sample so you can. Why arent they organising the docs themselves? I assume these are title or mortgage documents? Surely the UK has a online database where all these docs have been converted electroically and are available if you subscribe?
Why not just ask them to send you an Authority you can sign so they can retireve on your behalf if there is no database?
With the docs you found, I'd just send straight to the L and cc the XW.
Cheers DS
Me: early 40's XW: nearly 50 T: 15 M: 5 BD: Jan 19 S:10 SS: 22 SD: 24