The hate for TPMS always makes me laugh a bit. Yes, of course you can still check your tires with a gauge before you leave, but it's a little hard to do when you are driving down the highway at Interstate speeds! The point of the system is to warn you when there is a problem before it becomes a major problem. Slow leaks become ruined tires and potential accidents when you aren't aware they are deflating. The TPMS will warn you to get off the road while you still have a choice. It's pretty good for a system that requires a tiny bit of maintenance, at most once every 5 years.
The monitors have "exciters" in them that are activated with tire rotation. When they are activated, they communicate the tire pressure back to the receiver more frequently because it assumes you are driving the car. If the car is stationary, they report back much less frequently because there is a little reason to monitor a tire every second that the car isn't moving. In some ways, it makes sense that you'd get longer life out of a monitor on a Lotus because most aren't being driven with the frequency of a normal car, and are therefore reporting tire pressures much less often.
Unfortunately, I don't have the part number for you, but you can get it from the existing monitor. They thread in from the inside of the wheel through the valve stem (in fact, they are the valve stem), but the tire shop doesn't need to completely dismount the tire to replace them. They can just push down the tire to replace, with no need to re-balance. Obviously, the easiest time is when you are putting on new tires, but it will take a shop less than 5 minutes each to replace them. After replacement, you have to learn the new sensor IDs to the receiver, and you are good to go for years.
Jake in St. Louis