Well, it won’t be instead of leave and they will be paid at their normal daily rate. Unless I’m horribly out of date, they’ll also get subsistence allowance etc.

Well, not my problem anyway. Still doesnt sound like that good a deal but someone might be interested in it.

2 paid weeks off work to go MTBing in France for £300 with no deduction from your leave allowance.
Not a great deal?
If my current employer offered me this, I’d bite his hand off!