Families with younger children often lean coastal, since a beach gives you a ready-made activity that needs very little planning: buckets, spades and a few hours, and everyone's entertained. Couples or those wanting a slower pace, or a base for cycling and walking rather than swimming, often prefer the countryside or Broads setting, where the pace of the holiday matches the pace of the surroundings.
The short version: book peak weeks as soon as you know your dates, and treat everything else as considerably more flexible.
Self-catering is the biggest single saving available. A static caravan Tingdene Holiday Parks UK, with its own kitchen, means you're choosing when to cook and when to treat yourselves to eating out, rather than paying restaurant prices for every meal of the trip by default. For a family or group of any size, this alone tends to be the single biggest saving compared with a hotel-based break, where every meal usually comes at hotel prices.
As a rough guide: book six months or more ahead for summer holiday weeks, two to three months ahead for half terms and bank holidays, and anywhere from a few weeks to a couple of months ahead for a standard term-time week. If you're flexible on exact dates, you can comfortably push closer to the wire; if you're fixed on a specific week, particularly a school holiday one, earlier is always safer than later.
Booking your first stay at a UK holiday park can feel like a lot of small decisions rather than one big one, so it helps to work through them in order rather than all at once.
Neither setting rules out the other entirely. Most coastal parks are still within striking distance of countryside walks and market towns inland, and most countryside or Broads parks are usually within a reasonable drive of a beach for the day, so you're rarely choosing one to the total exclusion of the other. It's more a question of which one you want as your daily backdrop and which you're happy to visit as an occasional day trip.