When I had my camera converted to Infrared only, there was only LifePixel in the USA that could do this operation, so I had to order a sensor filter from them and get it fitted here, but now there is now a company based in the UK that will preform this operation for you. So if anyone was interested in getting one of your old digital cameras converted to Infrared use only, then try this company ( I have had no dealings with this company as yet so cannot give a personal recommendations for them) but as far as I know they are the only company within the UK that will supply and fit a Infrared sensor filter, so that you can use your camera handhold just like your normal visible light camera.
Advanced Camera Services
If anyone out there decides to have a go then let us all know how you get on.