The legal pack will be on Bidx1. If not, it will be put up before the auction.
If the house is adjacent, then you are probably the best placed to know about it. Maybe get a surveyor to have an external look and give an opinion. If you can get access for a survey, then that's even better. Assuming its a one-off house, check all the planning files.
Solicitors will always be devils advocate, so I'd wouldn't take huge notice unless it was an issue with title.
You will only have 6-7 weeks to complete the purchase if you are the winning bid.