Can anyone advise me as to the rights of a young couple with a toddler who have just moved into a rental property believing it to be a long term rental. They paid £80 of their rent for 11 months upfront as a guarantee. After moving in November ., they have now been advised that the owners are selling so they need to vacate by May. They have spent a lot of a removal and haven’t even fully unpacked. What are their rights?