D28boy, what exactly is the inconvenience to you though?
20Mph limit is demonstrably safer for pedestrians, cyclists and other road users, and in a populated urban area how often would you get up to 30 for more than a brief period anyway?
If it really is a small town then how far is it across town, 2-3 miles tops? so even driving right from one side of town to another at 20 instead of 30 the impact on your journey is a couple of minutes maybe?
And that's not even taking into accoun that most of the delays will be due to junctions and or traffic lights rather than an slight decrease in maximum speed.
YES- legal signs for the WHOLE OF THE TOWN.
Seems reasonable, the sooner urban areas are all converted to 20mph limits the better.