Got your PM
Right firstly to get it looking like a VT* you'll need to buy the following:
Front bumper
Rear bumper
Sideskirts
Front arches
Rear arches
Door mouldings
You can either pick these up from on this site, i think theres a couple in the 'For sale' section at the moment.
Alternatively you can get bits fairly cheaply from ebay- if you look well you can pick up most parts for £10-£20 depending on condition, Bumpers may be slightly more around £30 for rear anf £40ish for front
Of course on ebay you'll have postage costs aswel which will bump up the price. A reasonable local scrappy might be your best bet.
I wouldnt expect to pay more than £200 for the full kit
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In terms of spraying the kit of course it'll be ideal if you look for parts in the same colour as your car (what colour is it?) this will save quite a bit from getting parts resprayed.
A good price for spraying and getting a good job varies wherever you go, the place that i have mine done is usually about £50 a panel, with bigger ones such as bumpers, being a bit more.
£250-£500 will probably cover most peoples cost that have had the spraying done
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For fitting:
Have you considered giving this a go yourself? Alot of the parts are easy
Have a read here,
http://www.saxperience.com/forum/showthread.php?t=74587
and here
http://www.saxperience.com/forum/showthread.php?t=55973
for a description of how to fit the parts
If you dont fancy giving it a go yourself then a bodyshop will probably fit it all for £100 give or take a little
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All in all rough estimate lets say possibly
upto £200 getting kit
£350ish for spraying if you dont get parts in your colour
£100 fitting
Maybe £650 as a rough benchmark?