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Thank you for taking the time to reply, and for the welcome. Firstly, since yesterday the problem has not recurred. I've driven to work this morning, and since have driven about 120 motorway miles (6th gear virtually all the way) without issue. I haven't noticed any unusual noises from brakes, engine or gearbox since the problem went away. The car is a 2011 X7 model; I referred to it as a Mk II earlier, but perhaps I should have referred to it as a Mk III? There was no passenger in the car at the time the problem occurred. I can say it was definitely gear related to the extent that it was limited to when gear selector was moved to 4th or 6th position. I can't say with certainty at what speed the problem occurred at; it was likely between 30 and 55mph, but I couldn't swear to that. The speedo is working fine, and I think it was working fine during the time the problem was happening, but I wasn't focussing on that at the time so again, I can't be sure. I an be sure that depressing the clutch pedal wasn't the cause, as problem would only occurred after gear selector moved to either 4th or 6th position. I know I have said that the car "braked" on selection of 4th or 6th, but whether it was the brakes or something else that caused it is open to question. It felt like the engine breaking that happens when you accidentally select 2nd gear when you intended to select a much higher gear. It's a bit of a weird one, I agree. Given that it was -1 celcius when it happened, I'm thinking that it could be related to ice melting causing a temporary malfunction somewhere, but I may be clutching at straws. I shall try and move the gaiter around the gear lever and see if any wiring is being disturbed, as suggested by paul.h. I presume it just unclips from the base. If it occurs again I'll keep you posted. Thanks again.