A number of years ago we switched from our regular broadband provider (Tesco) to Sky as our service was very slow. Sky provide the service through LLU in our area and I noticed an increase in speed and reliability. Recently we have been informed that our area will soon be upgraded to fibre optic. As this is provided by Openreach, will I automatically be upgraded by Sky? Furthermore, will the service I receive be the same as that which would be provided by other providers such as BT? I assume that if I had to change back to BT from using a LLU provider then I would be charged.