I just keep steady - ease off to create a gap for the muppet to move into and just let him overtake me asap. No point in making a bad situation worse.
My wife Wildy though can be plain

She apparently has one road on her commute which has a 30 mph limit and most feel comfy at 40 mph

Sounds like I'm making excuses for them - but the low speed limit from what she says to me and one drive I made with her so that I could see for myself what she was on about

suggests to me that folk get a tadge impatient.
Only my wife does have an issue with anyone she thinks "too close" to her. What she does is just plain nasty

though. She uses the Gatso to what she calls "small advantage ping pay off" This Gatso is "hidden" behind a bus shelter just beyond a garage forecourt. She nips into the garage forecourt and watches as the tailgater from hell accelerates in his frustration and seems to take a very strange delight in this for someone who hates scameras in watching it flash them

She justifies this by telling me that inconsiderate, impatient and "rudey" oiks deserve all they get and says that's the one scam which acts as a "surrogate policeman".
I do the once around the roundabout.. pull into side street or lay-by myself if finding a persistent little oik behind me.
I don't find tailgating that much of a problem on the motorways these days but find it a problem when I drive to road conditions and limit on urbans. I do not know if this is specific to my commute from north of Keswick to a teaching hospital based in Lancs.