'It's a speed limit not a target' etc
But equally, on a good road in good conditions theres no reason why a competent driver shouldn't be able to drive somewhere close to the speed limit (sharp bends, single track national speed limit C roads etc excluded) and make reasonable progress without holding up other road users.
If you can't, you should pull over, when safe to do so, once you have 5 or more vehicles trundling behind you.