Thanks for replying.
The dimmer is from B&Q and 2 x 250w.
The new lights say max 40w (x 3) and they are those g9 bulbs, the little ones.
The wall lights are also max 40w each, so at most it is 3 x 40w, x 2 lights = 240w, plus 40w x 3 on the lights, 120, grand total 360w on a 2 x 250w...