Here's the lowdown.
We shall be in "Paris" for 1 and a half days (we would arrive in Paris early afternoon and then have all day the following day).
The options are (priced for the whole family)
1 day/1park £126
1 day/2park £154 or £132 if we book before travel but would then not have the flexibility of adding the 2nd day if we arrive in Paris earlier than anticipated(would we have time to do both parks?)
2 day/2park 278; hang on this is more expensive that 2 lots of 1 day/2 park...
So will we get value out of half a day, cos I guess we need to decide do we do 1 day or 2 days?