Isn't there a chap off here who does a chip? I keep meaning to buy one off him, but I have no idea how to fit it...and I'm not about to 'have a go' myself with something thats so crucial to how the car runs.
Adding a generic (i.e. fixed value chip thingie) is a dangerous game. It seems to be so hit and miss....sometimes it misses by a lot and actually makes things worse.
In the back of PVW and Golf+ you can get a custom re-map for your car for £200, that'll make it run like a peach - all the time, every time.
For the difference that is barley noticeable, I don't know if I'd personally bother. My engine alone cost £2500 so I don't know if I'd trust a £20 eBay wonder.