I hear on the 1.2 at least 60mm is needed! Should buy coilovers instead of springs.
If it's a MK2 PH1 look for PH2 rear lights, they work a treat and make the car look nice also. Then there are dual optic lights (which i am selling) that you can upgrade.
going from a 2005 Toyota Corolla 1.4L VVTI where you cant mod anything will be nice
How much £ have you got to spend on suspension? Set yourself a budget and that will give us more of an idea about what springs/coileys to get any pics of your car mate?
for your pics upload to photobucket and post the link in your thread