I've found a commercial/investment property in South East England that has gone to auction due to bankruptcy of the owner.

I've only talked to MHP owners through BP or FB groups.   

Owner offered me 35k with owner financing, however he wants to talk to his renter that rent another property of his that borders the lot I’m interested it.

I have not personally experienced this but I have heard stories where leaks occurred in the unit above and trickled down to their unit causing issues the owners just couldn't avoid.I'm not saying its a good or bad investment. 

If I recall correctly, it creates a liability for the owner by muddying the legal water if an eviction were to become necessary if they violate other terms of the lease.

Meredith,Most regular Policies for an owner occupied or rented dwelling will want to insure the building for Replacement cost. 

This is technically a 1BR with a den...it's non-conforming so it may work as a rental, but you've got to make it conforming to sell it to an owner-occupant...

Can you find wholesale deals from those who sell by owners?

I still no nothing on probate at all really starting to look into because a few of my leads will be probate situations but if the owner has no heirs is there still a way for me to get the property

Ask to speak with some of their current owners and current/former tenants.