find an m car specialist, afraid i wouldn't have a clue over in ireland, its particularly common on the M3, and with others getting on a bit im not surprised to see lower power versions suffering too.
there is no "easy way" subframe off and weld it.
there is no "easy way" subframe off and weld it.
need a part number? http://public.servicebox.peugeot.com/ and http://service.citroen.com/ will sort you out.