does any 1 know how much extra bhp a chip and remap will give my mg zr vvc 160? and what other modifications i can do to get more bhp cheers 
Not a massive you can do on the cheap tbh, Cat-back exhaust and induction like has been said. But to get anything above 5bhp-ish your looking at alot of money.
On a side note, where in kent are you from, and welcome to the forum.and pics of car are needed
^ by chips, i'm pretty sure he means an ECU piggyback (like a megasquirt or the likes), which is soldered into the ECU and makes it more (if not fully) programmable.
Also, heavily modified cars are actually cheaper to insure when done through specialist insurers. My ZR Rally car actually costs less a year than my Road-one did. And my Rally one is still registered as a ZR160, even though it's got a 1400S engine (150ish BHP).