corsa lowering springs

I recently got a new car (2017 limited edition Vauxhall corsa), loving it and want to modify it slightly. I'd like to lower it and was wondering if anyone could recommend any springs that are not going to ruin the ride that are good? thinking of lowering 20-30mm. Also wanting to wrap my badges and tint my rear lights. I've done a bit of research but thought I'd ask on here, is there any good quality wraps you know of that I can purchase and also for the lights. I only want the lights slightly tinted so just a lighter black.
Thanks