So there is no point checking HT leads, plugs etc any further as you don't have a spark from the coil, I think that module on the dizzy is an inducive pickup as I said in the post earlier (Basically the simplistic form of breakerless ignition) on the RST I think the info from this is then fed to the ECU which has a vaccum pipe attached to inlet manifold, thats what I suspect the setup to be.

Check the green wire from coil has not broken (This is switched by ECU, the black is switched live) although as you have power it must have continuity but may have broken and shorted somewhere.

Martin