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I used carpet I got from a kit car show that had a plastic backing, and I kept it in place with velcro, found a small company on ebay, contacted them direct and got a good amount, seems to be working well.
A little tip is to run a bead of mastic along the rear top pannel where the boot lid rests on and the square box section chasis meets as water runs down behind the panel in the rain a wets the carpet, assumng you will carpet the rear.
You may have already done this, but otherwise, I was reccomended to carpet over the heater, or at least some way of covering the sharp bit for SVA.
Cheapo carpet from a kit car show, and contact adhesive - so I can treat it badly, and not worry about the replacement cost. I did it, not because of noise, but because the exposed aluminium will scratch / dent and look horrible. I think any attempts to decrease the noise, are going to be a little fruitless, owing to the mesh vent right behind your head.
I don't know how noisy the Rover k-series cars are, but the mechanical, induction, and exahust noise of the Type-R engine is impressively loud when pressing on. It's a very raw experience, and is what the car is all about in my eyes.
To cover the heater I used 'for sale' sign plastic board, with carpet over it.
Likewise, spray-on contact adhesive (high temp stuff) and then carpet direct to alu panels. I didn't do the floor - left it with the rubber/chassis rails which I think looks nice.
I used hardboard panels covered in carpet under the dash, one the passenger side to cover the heater and one on the driver's to cover the steering column. Neatened things up nicely.
I used velcro where the side-panel carpetting meets the GRP so I can peel it back and get at my fastenings for removing the bodywork.
Richard