Thanks! It is the Bosch plugs I have ordered, so that's a relief!
So, if I understand this correctly, I hold the base of the cable and twist to remove, and then I use the socket to remove the plug.
I'm a bit nervous, but I have been wanting to do it for ages.
---My Previous MBs---
87 300SE (Sold) - Black, Cream Leather
89 300SE (Sold and missed) - Black, Cream Leather
87 420SEL (Died!) - Bronze, Black Leather
---Father's Previous MB's---
2004 S320 CDi - Black, Cream Leather, 18" AMGs
2001 CL500 (Stolen!) - Black, Cream Leather
1999 E55 AMG - Black, Black Leather
1994 500SE - Black, Cream Leather
1990 300SE - Midnight Blue, Cream Leather
1986 420SEL - Diamond Blue, Cream Leather