Penny, if your friend's marriage breaks down during the period for which she has been allowed to stay, but she wants to remain in the UK, she will need to apply and qualify to remain in the UK on a different basis (definitely NOT SET(M). If she is brave enough to spill the beans, she can phone 0300 123 8895 to find out whether she might qualify to remain in the UK in another capacity. Try visiting the Home Office website too and find information about staying in the UK. She can also get help from an immigration adviser ( eg. IAS ) but she must be careful in choosing one because some are only after on the money. I wanted to say goodluck to your friend, but she puts me off a little bit as she is selfish on admitting she only wants an ILR for marrying this brit guy. The adultery is another story