VAT on B2B services (general rule) Invoice from UK company to UK company conference in EU

We (a vat reg UK company) are supplying to a UK customer the organising of a conference in the EU e.g. France. As advised by accountant this is a B2B service under the general rule. We are charged local EU VAT on the conference. Do we then have to charge UK VAT to our UK customer as well (as supply rules relates to where they are ( customer = UK) not where the conference is held (France)? Our customer thinks they are double paying VAT. Any guidance would be helpful. Thank you.

Hi Kat Leslie,
 Please refer to notice 741A section 6.3.
However, if the supply involves the selling tickets or a service directly related to land, see section 7 and 9. 
Place of supply of services (VAT Notice 741A)
Thank you.