OEM wheels as you may already know are 112 x 5 and a 51 offset. and 8" wheel would poke 6mm more with the same offset and so the difference with these would add another 9mm of poke from the 51 to 42 offset. Overall you will get 15mm of extra wheel sticking out. They will fit but you may get some rubbing if your car is lowered.
£260 is peanuts for a set of alloys...even reps. So that would make me a little wary about how good the quality is. However if your missis demolishes them on a semi-regular basis, there is no point in splashing out much more on them TBH.
