Well fellas, thanks for the advise. Just to give you an update, on Thursday morning I went to get in the car and noticed a flat tyre, I went for the spare but that was also flat (Lexus b/ham where I got the car from dont accept responsibility for their oversight of this). Anyway I decided to get new tyres. So I went for Michelin Pilot Sports and get them all changed. After relieving my pocket of some hard earned dosh, guess what - its driving like a dream again. Mind you, the Pirelli P-Zeros I had were pretty worn and also had numerous cracks, I'd never recommend Pirellis as I only had new ones put on last Sept, and they looked all perished and full of splits. I know that late at night (only late at night - no traffic) I do push the car round bends and roundabouts but didnt expect to see them so out of shape. They felt al bumpy and not smooth and the tyre dealer told me that this is common of pirelli's - so fellas - dont buy them.
Also - I know I probably should'nt have, but I went for 45 profile instead of 40's. The roads in London were really starting to rattle the car. I know this has altered the rolling radius but by how much? - I actually prefer the ride now much more and have less chance of kerbing the rims.
Anyone like to comment on this ?