Regarding your first point, Leeds Met. do not interview their applicants, they just simply use other methods to select the right applicants. btw...will you be going to the informal open day on the 8th March or 10th May ?
From what i understand of conditional and unconditional offers....
Conditional - where the uni actually states a specific set of requirements they want you to meet, in order to gain entry
Unconditional - is where the uni basically accepts you with open arms, with very 'loose' requirements e.g. a minimum of 100 points