When my son started medication, I was warned that too low a dose might actually make things worse instead of better. That’s counterintuitive but accurate. You may want to talk to your doctor about increasing the dose a bit to see if it helps.
There are people who require very low doses of stimulants, lower than manufactured in a single dose. Vyvanse can be titrated in liquid to get a smaller dose than the 30 mg capsule. If you have any liquid medications in the UK, that would allow you to really customize your dose.
ADDitude Community Moderator, Parenting ADHD Trainer & Author, Mom to teen w/ ADHD, LDs, and autism