iirc the main difference was the engine, phase 1 was silvertop and phase 2 black top.
i think the wheels (maybe just centre caps_ were different, and a few other tweaks to bits of trim etc.
my mate used to have a ph1 and it managed to melt a piston, aparently fairly common???
hes now got a ph2 and he's not had a problem with it, its done over 100k now and runs like a dream.