WEve just got back from Sherwood Forest but went to Elevdon last year, we go every Feb.
If you want to eat at a specific time then yes I would book - they take a £1 per head booking fee now as so many people just were turning up.
IF youre quite easy as to say having a drink in the bar whilst you wait for a table (kids can play in play areas) then no.
We didnt book Hucks on the first night but got a table within 25 mins, the next time we did pre-book as our DS looked shattered during the day so knew he would be restless, so booked had a great meal then got home early enough to put him to bed.
I must pre-warn you though, although you may not be too bothered, but this is the first time I have really been shocked at the prices, - £6.70 for large glass of pinot in the Sports Bar and £17 a bottle, £3.60 a pint. Also food in most of the restuarants seemed quite hiked up on last year.
We ate out but sometimes took a sandwiche to the pool in the day time.
Have a fabulous time! I want to go back!!!