Sale by tender? Can i do this with my flat?

Question

I'm in the UK

Answer 1

if you own this property then yes you can

Answer 2

I hope, in asking this question, that you own the flat.

To sell by tender is legal because you are inviting people to bid for the sale, just as an auction system would work.  However, you will still have to allow viewing and often, the cut and thrust of an auction tends to allow prospective purchasors to try to outbid rivals.

My advice, for what it's worth is go for auction,  not tender.