How about a straight ask:
“Is there any reason to change my treatment?”
There are only two possible answers to this - No or Yes.
In the first case - no problem
In the second case, remember that consultant must write to GP, with a copy to the patient, detailing the consultation. What is in the letter should be an accurate account of what took place, so either there is something to discuss with the GP, or the GP can be asked for details if there is no copy.
Just watch out for some odd words in the letter - most consultants and many MS Nurses dictate their letters and the person transcribing may not inderstand the words - and just write down what they thought they heard. That, of course is another good reason to ask the GP.