I find that the sizing of some Loakes vary. I have UK size 9 Chesters and UK size 8.5 Strands. I have to wear arch supports in both. I have to wear these supports in all my shoes except for one pair. I am still trying to find out what is different about these particular shoes. Finally, I have shoes that fit well that are UK size 10.
If you do have to wear arch supports, it is a good idea to take them along to the shoe shop when you buy new shoes. Then you can see whether or not you are going to need them and also what size of shoe you are going to need.
The Chesters and Strands are on different lasts (024F and Capital, respectively).