Howdy Ian, from across the pond! Wow Yorkshire, that's Diana Rigg territory! I hope you really enjoy scootin' as much as we do. (love surprising Chinese detractors with what my "deathtrap" can do.) BTW, a lot of us have switched to sliders instead of roller weights (no flat spots) you also might want to look this over.....
http://x1scooters.com/pdi.html
GOOD LUCK!