I know what you mean...
Had the same problem on my EP2, Honda quoted £120 which is essentially to tighten the seat brackets on either side as I found out.
Its not the bolts holding the frame to the floor, its the bolts holding the frame to the seat, you need to take out the centre console part where the handbrake is on the other side where the bolt is, there is also 1 on the other side below the cover where the height adjuster is, all you then need to do is tighten these bolts with a racket and star shaped head which will be loose.:lol: