There seem to be at least 2 types of toggle switches. I’ll call them TG1 and TG2.

There are at least 3 different types of rocker switches used in the Vixen and M series. I will designate them RK1 to RK3. RK1 was the earliest used. RK1 was made by Arrow in the U.K. I don’t know if this is the same company as Arrow in the U.S.A.

TVR Switches
Family	Maker/Type	Picture
TG1	There are a number of Lucas toggle switches which externally differ only in the shape of the bat (handle) and if it is on in the straight or bent position. Behind the dash, different families have different bodies and numbers of contacts. These look like 45SA, 57SA, 65SA, 79SA or 108SA
TG2	I believe these to be a Lucas 108SA with a special bat.
RK1	Arrow Also used in the Vixen. Used by Lotus. These are Household switches rated for 10a 250v a.c.
RK2	Lucas 159SA Also used in MG B and MG Midget. This variation of 159SA was illuminated per NHTSA rules.
RK3	Lucas.