Why just Megajolt? There are plenty of programmable ecu's that can do the ignition. F.e. this one:
http://www.ebay.co.uk/itm/Omex-150-C-3D ... 3372138969Although this one is too expensive, i've seen Omex 150c been sold for 150 pounds. And these are still being sold new for the A-series (spi and mpi models), so mapping should be available. Another cheap ecu are the Gotech's. Quite rare in Europe, but every now and then they are on offer, sometimes on a tuners forum. It seems a Gotech pro with wireloom does 200 pounds although I've seen being sold once for 100 pounds. And these can do injection as well. Another popular ecu is Emerald, I've been chasing these for my car but they still fetch between 450 and 500 pounds. Amazing because new they are under 600 pounds.
Generally every ecu that does just ignition can be used and they should cost no more than 200 pounds. This was an interesting one too:
http://www.ebay.co.uk/itm/190642904280? ... 1423.l2649But I am going injection as well, so I didn't bid on this one. Just sold my HIF44 carb and bought a set of Honda firestorm throttle bodies. When I have them I can start making an intake manifold and airbox. Alas still haven't found a suitable (= affordable) ECU that can do wideband lambda.