Hello guys, first time on this forum and first time i'm gonna buy a motorbike in UK, I am from Spain so sorry in advance for my english, hopefully don't bother you. I have plenty of doubts about legal stuff and I keep reading and learning lots of things about how the things works in UK but i struggle with some information about the modifications on the bike, my questions are: 1. What happen if I don't declare the modifications to DVLA? 2. What happen if I have an accident and I declared the modifications to my insurance but not to DVLA? 3. I see many advertisements about bikes with modifications like exhaust, wheels, cosmetics etc and when i ask nobody declared nothing, why? 4. What happen if I have an accident, the bike have some minor modifications like the exhaust, colours or wheels and I didn't declare to my insurance? 5. What happen if I have an accident, the bike have major modifications like engine or cc upgrade but they are not visible until you really investigate the bike with a mechanic, do i should declare that or is ilegal? 6. If i want to declare any modification to DVLA or my insurance, do I need any certificate about the modification of the bike? if is yes, how can I get that? 7. How I know after modify anything I can pass the MOT without problems? And I think that's all, so sorry for so many, the reason why is because I'm looking for a DRZ 400 and all of them out there have some changes, some of team just the exhaust, hand guards or the front light and others with a lot of stuff like 3x3 mod, cilinders etc and I'm very confuse.