im guessing it must be the m100 im not too sure as i havent had a chance to check the vin and im new to the older shaped lotus's but it is an a,reg car 1983. this is why i want some pics posted so i can compare them and double check
M100 Elan, first appeared in 1989 available on a 'G' registration onwards. (Private or cherished registration marks can show the car to be older than it's first reg date, but not younger)