there is a much simpler technique for paying tolls in rhd car. it was demonstrated in I think, the Gumball Rally movie,
1. wind down drivers window
2. extend right arm, with coins in hand, out of window
3. throw coins over roof in general direction of hopper.
4. if you miss and run out of coins, get out of car, pick up coins and walk to hopper!
On a more serious note, toll booths all take credit cards. Easier than messing with coins.
Speeding.
Never been targeted by french police whilst driving in a GB car.
I got a camera ticket in an FR hire car last year down near Antibes. It arrived in uk by post about a month later. Mates were most impressed i'd got a ticket with 115 on it! (km/h of course). Still living down the fact i was driving a Hyundai though.
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Are you likely to speed in a "Land Slowver?"