No but lots of these kits are Jamex, which are renowned for being pants (despite being TUV approved). Also the fact that it claims there are four springs in the title, says to me the seller doesn't know his onions.
Well for springs - heard good things about AVO (buy at Brickwerks or Bluebird) and also the T4sRus own brand ones (made in the uk) are supposed to be up to the job.
Shocks - On a budget... not sure. Lots of people who have lowered run standard shocks anyway though (free!)
However having just spotted that you live at Silverstone!! I recommend Bilstein B6 dampers, H&R Springs, and the addition of a rear anti roll bar. Unfortunely whilst this is reputed to be the ultimate T4 set up it will cost around £1000
Hope this helps (well the first two points anyway)