Don't you think that's a tad humiliating pinning a notice on the front window? My neighbour, but one, has it posted on his. Now we all know his private business.
Not that I would judge, it's just a little bit cruel, imo, it's kicking someone when their down.
If he hasn't responded to letters or knocks at the door then I guess they are obliged to demonstrate that they have unequivocally notified the occupants of their intentions.
I'm sure they have been given plenty of opportunities to resolve the situation, if they've buried their heads in the sand hoping it will go away this is the consequence sadly.
I would imagine it's a last resort when all contact attempts have failed.
I believe that if a landlord gives seven days notice for the recovery of items, they can then be removed at cost to the tenent and sold to defray costs.
As well as contact, it's probably a way of giving notice to as many as possible of the situation as the lender or their agents won't know who is or has been living or staying in the property themselves.
There may be other family members, tenants (possible without tenancy agreements, the property has been let without the lender's knowledge) and all kinds of other people staying.
There is also the risk of squatters if the owner being repossessed has already left the property.