I used a long slim cold chisel and cut the heads off. I have positioned the connector blocks that Bosch supply with the universal Lambda Sensors, where the P clip was and held that to the chassis on either side with a cable tie. I have a pop rivet kit but the pop riveter I have in France is a big two handle double leverage one (looks like a big bolt cutter) for doing the 6mm stainless rivets on the bodywork, so I cannot get it in to where the P clip attached to the chassis. The connector block is so that you can move the original quick disconnect loom plug from the dead lambdas by cutting the old wire and connect it to the new lambdas. The wire leads were all the same colour on the new (2 white heater wires and grey and black sensor wires) as the original. From appearance, the old lambdas were also Bosch. Made life a lot easier than the Magneti Marelli ones with all white wires. The first one I did seemed a real fiddle but once I had worked out a better order to do things, the second one only took me about 30 minutes from start of removal to all connected and secured. Now the next job is to replace the coil pack and plug leads, then hopefully my misfire will be history.
The universal Bosch lambdas were €55.00 each rather than £158.20 each for OEM Morgan ones. Worthwhile saving for a few minutes fiddling about moving the original quick connect plugs over.
Wilson