I am in Chigwell.
The course I attended was organised by the Epping Forest Beekeepers.
You can contact Robin @ Epping Forest Beekeepers
Robin said the course is available on a 1st come 1st basis.
How come you had to get to screws from B&Q, if you purchased the complete FlowHive you would have had all the items to make it.
There will be people who will discourage you on using the FlowHive, I would suggest learn what you need to be a beekeeper and the FlowHive Beekeepers in Essex can guide each other.