The information on the page linked to refers to the 1st June but whichever year?
One further question, does it include calls to UK mobiles when both are roaming e.g. my BT mobile to an O2 mobile which are both in France?
That link is the latest published information.
I think if you have specific questions regarding your needs and your account to speak to the mobile chat team to confirm your account is all set up for roaming and any account questions.
It wouldnt be wise for anyone to give this type of advice without checking credit limits, allowances or restrictions that maybe active on your account. In the past the mobile accepting a call whilst roaming abroad would accept the international part of the call as the person calling would'nt know where in the world you were at the time of call. I am not sure how this works now with each netowrk offering different roaming deals.