Yeah that 6 mark question on banking was the worst! I haven't seen a question as vague in a long time. The fact that it mentioned problems kinda threw me off, because SET, SSL, Encryption are all how to SOLVE the problems, but what are the actual problems? I think I ended up talking about card fraud, hacking, computer misuse act and the data protection act, but honestly I had no idea what they were looking for. Actuation? No clue haha, but I think I got the example (thanks CCEA revision guide). Central Heating one wasn't too bad, I think I used temperature sensors as input, processing was an ADC, output, adjusting the heating/turning on radiators or boilers, and output - an orange light to show boiler is or/display info on an LCD screen. It wasn't the worst, but it could have been better.