The resent above comments made me smile! Exactly what I wanted to hear... 
So basically I just need to do my research, Is there any specialists about thats best to talk too? Names etc etc?
Not sure on what power I want it was more of a case of seeing if its possible 
Will go on club polo then and have a word with a few people on there and see if i get anywhere. Thanks guys really aprietiate the imformation.
Your still missing the big big point, a Polo is lighter than a Golf mk2 and it is hard to fit bigger engines hence tuning the 1.3, in a Golf what is the point of spending money for little gain when you can drop a 1.6 or 1.8 in and gain much more.
Sorry to be harsh but tuning the 1.3 is 100% pointless and a waste of time and money.
If you really want to make it quicker as has been said drop a 1.6, run a webber carb and you will see worthwhile gains.