it can be done if you are willing to spend the money, basically you will need all parts from an r5 turbo, carb breather system, manifolds etc and you will need to drop the compression! To be completely honest, you are much better off replacing the 1100 with a complete 1400 turbo engine, as you will have a stronger base to start with and have a much better power potential! you can pick a complete donor car up for under £500, much cheaper than sourcing all the bits required to turbo the 1100.
hope this helps
TT