CAA web-site. Index on the left, "Publications", "Search Publications", "Flight Crew Licensing", (way down, next to the bottom is) "Flight Crew Licensing Forms"....long list of forms.
For the TMG addition I would use the
TMG Application Form
For the IMC rating, I would use the
IMC Rating Application
The
charges for these ratings are £64 each - until March 31st, 2003. Expect a small increase on April 1st.
Hope this helps.