250 GBP would do it, i am sure any decent curry house would give us 2 hours for that money, a full demo of the cury gravy, the ingrediants laid out, the process of putting the base together and the cooking of two final dishes of our choice.
All of the above plus capturing on video and ability to take notes during the session.
I think that would be good value for 250GBP, and if we are happy we will be back for more lessons.
Stew