I've only gone to Rock n Gem shows at Kempton Park as a buyer.
It's quite a large venue which can be on two floors if it is inside the building, good parking but pricey to get in. Food is usually available but again, pricey. There is a cash machine for visitors but it charges to withdraw money (at least it did the last time I went).
It's a long way to come on a hunch and I don't know how you'd plan to stay over for the couple of nights. It's a bit of a faff to get to any nearby shops.
I know the R&G shows pop up all over the country so presumably there are some nearer to your neck of the woods?
Malvern may be a better bet to try out if you want to choose either of the two.
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My body is an old warehouse full of declining storage, my mind is a dusty old reference library, strictly for members and archaeologists only