Selling a property does NOT automatically end leases
so in short you go on paying rent to the new landlord.
He - the lucky winner at the auction - has to follow the rules about ending leases and throwing you out if he wants to - the same as the old owner.
No way you could buy it - there bargains to be had at auctions esp if this is a forced sale ?
Blimey if no one has been around to view - it may be a dood deal
From what you say it looks a though this is a purely business deal. As you are a sitting tenant it can't be sold with vacant possession. You haven't been given any notice yet. Just sit tight, it would appear to be what it says, an investment. The purchaser will probably not be interested in the flat as a residence, merely a source of income.