Firstly, does that allow me to take off into IMC...
Yes, it does.(The min. vis of 1,800m is in the process of being changed to 1,500m to eliminate the anomaly) Whether you feel you are current enough, is up to you.
Does anyone know what you need in terms of avionics?
As Bose suggests, you need the basic six IFR instruments, (preferably, but not necessarily in the 'six pack' configuration) plus at least one navaid that gives lateral guidance, such as VOR, or ADF.
Technically you could complete your training with just a VOR, and do an SRA or PAR for your second approach, if all you want is an 'IMC' badge to wear.
If, however, you want an IMC/IR(R) Rating you can
actually use to fly approaches at most places in the UK, you will, as Alexbrett suggests, need an aircraft with at least; VOR, ILS, DME, ADF, and Transponder.
I'm not sure also if IMC/IR(R) training has to be done under the auspices of an ATO...
No, it doesn't.
MJ
