Call Charges Onboard

In a couple of weeks, I need to be on a conference call whilst on board. It should only last 15 minutes. I’ll prop up the bar to avoid being a nuisance but should only have to talk for all of 5 seconds regardless.
It’s an 0333 number. Any idea of the recent call charges? I guess it’s carier based too? I’m with Vodafone with all the roaming things switched on.
It’s an 0333 number. Any idea of the recent call charges? I guess it’s carier based too? I’m with Vodafone with all the roaming things switched on.