Your 16 year old will be allowed in, it’s the little ones that need babysitting that they don’t like! They like them to be in The Wild Café instead. You’ll all be fine in The Herring.
You will be able to predict what’s on the menu as if it’s the same as before, it’s what is leftover from lunch, just given a different name when written on the menu. Then for the following lunch it’ll be given another new name. But the food is locally sourced, organic where possible, really good. They have great chefs who add a twist here and there. One thing to note: Breakfast items not on the menu can be added eg if you fancy a boiled egg but it’s not listed, just ask.
The things that have changed shouldn’t affect you if you don’t have youngsters, as that’s where all the change has taken place. The play areas have moved, the dance floor was the kids entertainment zone but is now aimed at your market eg sociable drinks at the bar.
There will be pool (as in snooker) there’s a library, there’s so much, it’s lovely and if you get to go to The Scarlet (it’s sister hotel literally 200 steps away) that really is luxury. My absolute heaven. My go-to.
Well worth looking at, even just online for the future 
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You’ll be fine there, nothing is too much trouble...please don’t be put off by the approach (the carpark) This does nothing for what’s hiding inside. Never judge a book by the cover x