No idea who is paying what and don't care as it is nil cost to me. All the shop wanted wa an e-Mail address so Brompton can confirmation with me that my frame number has had the remedial work completed which they duly did.
Also, I purchased the Brompton second hand and no proof of purchase or ownership required. Arranged booking by phone for date of work to be completed, arrived with Brompton, work carried out, smiled and left.