You must prove that you’re:
18 or over
free to give notice of marriage, to marry or enter into a civil partnership in the UK within 6 months of your arrival
in a genuine relationship
visiting the UK for less than 6 months
leaving the UK at the end of your visit
able to support yourself without working or help from public funds, or that you can be supported and housed by relatives or friends
able to meet the cost of the return or onward journey
not in transit to a country outside the UK, Ireland, Isle of Man and the Channel Islands