Rustle. There are no requirements for limited panel or 'no static' approaches on either the initial or revalidation of a UK or JAA IR. The only limited panel (no gyro compass and no AI) requirements on the initial IR are straight and level, straight climbs and descents, level rate 1 turns and unusual attitude recoveries. On the IR revalidation/renewal only the turns and UA recoveries are required.
Be careful of defining 'partial panel' as loss of static instruments. In the RAF and other organisations it means loss of the main AI but availability of the standby AI.
As far as the IMC rating is concerned, Para 4 of Appendix B to Section E of LASORS lists the test requirements (see KCDW's link). The only limited panel work is exactly the same as the initial IR. There is no 'no static' work on the test.
Whilst it is important to realise that attitude plus power equals performance and so the aircraft can be flown without the ASI and altimeter in order to climb out of cloud or descend (if cloud base allows) - it's not something to get really excited about. BTW don't believe all the stuff in the books about the ASI freezing on the speed when the pitot gets blocked - when it's happened to me it just slowly drops to zero because of the leaks in the system.