Nah, that's not high at all. 100C equals only 212F, and most manufacturers these days aren't turning on cooling fans (aside from with the A/C) until 220F or more. The Lotus manual even says not to worry about high temperatures unless you get to the warning light level - but I would never let mine go that far.
Keep in mind that the gauge is not linear; that is, it has the widest "swing" in the normal operating temperature range (82C - 100C). If it appraches 120C, then it's time to start worrying a bit. An engine is most efficient at warmer temperatures, so don't be tempted to remove the thermostat or install a cooler one. I've seen some on these forums who believe it will help prevent liner leaking issues, but that logic is completely counter intuitive. Once the thermostat opens at the stock 82C, there is no difference whatsoever. The only thing a cooler thermostat accomplishes is making your car less efficient, more of the time. (** all assuming the car hasn't been modified from stock requiring changes to the cooling system design **)
Enjoy that car. It's working perfectly!
Jake