Hey there, welcome..
I also have a 1.4 they're fun aren't they?
okay, so i think i can help here, the splitter is from a seat ibiza MK4:
http://www.ebay.co.uk/itm/Seat-Ibiza-MK4-6L-Front-Bumper-Cup-Chin-Spoiler-Lip-Sport-Valance-Splitter-Cupra-/320977020628
Although personally i would say it looks best on the front but each to their own,
the side skirts i have not been able to see much in terms of getting hold of them, rover 25 ones are easier to source but fitting may be an issue but im sure you could trim and stick where needed:
http://www.ebay.co.uk/itm/rover-200-25-mg-zr-side-skirts-/321792197233?pt=LH_DefaultDomain_3&hash=item4aec4f4271
As for the wing mirrors, i have no idea whatsoever. apoligies. 
