How can I tighten a loose toilet seat?

I have a Roca Dama old model WC (approx. 10 years old), and the seat has become loose. I know the hinges are tightened with a allen key, but I cannot find any way to get to them. Can you help?
Neil, October 2017


done
You could always try contacting Roca and asking them:

http://www.uk.roca.com/where-to-find-us/contact-us/technical-contact

fdsafdsa, October 2017