Re: Sinking suspension !!
Did you have the tyre replaced with one of identical make, different makes of tyres with the "same" can have slightly different rolling radii.
Drivers side of car often rides lower than the passenger side as the weight of the driver and the offset of the engine put more pressure on that side of the car and the springs get tired. It's pretty unlikely that the damper is damaged, thats what the bumpstop is for, ride height is controlled by the damper rod length and the spring strength (poundage) and coil winding pattern. The most likely explanation is that you noticed the problem for the first time because you were more alert to that side of the car after the repair, the same way you don't notice getting old until you look at an old photo, it's just too gradual to notice day by day. If you can establish that the pothole was there for more than 48 hours before you hit it then the council are liable, dosn't matter how long it took them to repair it afterwards, their inspection would have had to take place no more than 48 hours bfore you had the accident.