Thanks for the replies guys.
The wheels are 19 x8 front and 19 x9.5 rear and the wheel and tyre package was originally supplied to the member I bought them off by one of the very well respected traders on here. Not sure why the 'odd' tyre sizes were provided (they're Falken's), but I'm sure there was a good reason.
The wheels are currently sat in the garage at the moment, waiting for the weather to improve so I can fit them (they have a chrome lip, so won't mix well with the grit/salt/crappy road conditions we have at the moment).
It's gonna be a suck it and see exercise I think - whatever it takes to make them look right, well, so be it. I'm sure with ET20 on the front and some spacers on the rear, so ET15-20, they'll be fine
I'll post some pics and await comments once they're on