If your plans mean you need a later checkout or an earlier check-in, it is always worth asking the park directly rather than assuming it is possible. Some parks, including ours, can occasionally accommodate this depending on how the turnaround for that unit is looking, but it depends entirely on what is booked either side of your stay, so an early ask gives the best chance of a yes.
What generally does stay open regardless of season includes reception, essential maintenance and emergency contact arrangements, along with any general shop or laundry facility, though even these can run to shorter daily hours in quieter months.
None of this is guesswork you should have to do alone. Most parks, including ours, are happy to answer specific accessibility questions by phone before you book, and it is far better to ask directly, „does the shower have a level entry“ or „is there a step at the front door“, than to rely on general marketing photos. A five-minute call before booking is the simplest way to arrive and find the unit genuinely works for you.
It is worth checking the cancellation and amendment terms attached to your specific rate before you commit, particularly if the weather or a specific event date matters to your plans. Terms vary between a flexible rate and a non-refundable deposit rate, and the booking page should say plainly which one applies to the price you are looking at.
A fully flexible rate typically allows a date change or a cancellation with a reasonable amount of notice, sometimes with a small admin fee, while a lower, non-refundable deposit rate usually locks in the price in exchange for little or no flexibility if your plans fall through. If a change of date rather than a full cancellation is likely, for example around school Lincolnshire coast holidays or a specific event, it is worth asking at the point of booking whether an amendment is possible and what it would cost, rather than finding out after the fact.
Inside, look for a wet room or a shower with a level or low-threshold entry rather than a caravan with only a bath, wider doorways through to the bedroom and bathroom, and enough turning space in the bathroom itself to use it comfortably. Grab rails by the toilet and shower, and a bed at a workable height for transferring, are worth asking about specifically if they matter to you, since photographs on a booking page do not always show this level of detail.