That is correct on order of magnitude, at least (25 pounds ~ $33 today). That's one of the reasons Steam is no longer accepting bitcoins[0]:

  > transaction fees that are charged to the customer by the Bitcoin network have skyrocketed this year, 
    topping out at close to $20 a transaction last week (compared to roughly $0.20 when we initially enabled Bitcoin).

[0] http://steamcommunity.com/games/593110/announcements/detail/...