Thank you for your advice and help :)
well, i tested it this morning on the way to the office. it shuddered almost from the second i pulled away from the house, and then seemd to ease off again after a couple miles, but came back once i was about half way. when i got to work , i felt the discs and there was no discernable difference in temp to me, but they both seemed hot enough to fry an egg on. the wheels themselves were almost cold.
the shuddering always seems worse first thing in the mornings, and then comes and goes throughout the journey, sometimes very bad and other times just noticeable. i have noticed that the brakes are sqeaking under very light braking and if i brake on full steering lock sometimes there is a clunk?? don't know if this is useful information or not but i'm just trying to be thorough...