I have left bad debts in the UK?

After I was released from prison I could not pay the banks and credit cards I owed and left the UK. All cards and loans were unsecured. I contacted everyone I owed money to and asked for more time to repay but most were not helping me. I was so stressed and did not know what to do so I buried my head in the sand and ignored all of them. This is 2 1/2 years ago. Is it best for me to come back to the UK and go bankrupt or just do nothing and will the eventually write the debts off. I feel bad about all of this and am lost what to do. Can I be stopped entering the UK again at pport control as I left bad unsecured debts before?