Those gecko's use a similar technology to older leadshine DM drives (or the many copies of). Good drives, but you'll pay far more for Gecko than a comparable Leadshine in the UK.

For a similar price in the UK, Leadshine EM drives (EM's superseded the AM) have far better performance than the Gecko's, and more features.
Based on buying 2 or more, a G201X is £97.84, a EM806 is £87.78 (Both 80VDC, but 7A v 8.2A)
G251X is £60.57, and a EM503 is £69.30. (Both 50VDC, but 3.5A v 4.2A)
(all those prices are excluding VAT, as charter only show exc. VAT)

As much as I dislike suggesting them after their dodgy Zapp domain redirecting escapade, cnc4you are probably the best option for a UK source of drives similar to Leadshine DM's, as Zapp only sell the smaller DM drives. They do have bigger Kinco drives, but they're a similar price to AM's.