There is one at Pontispool early July, Mendip plains have one in August, that's as far as I got with looking as enough for ours to do, Bicton usually run some and Pontispool may have other dates, most of the venues have regular jump hire or competitions, whether they are scary or not I have no idea, it depends on what you think of as scary.
A really lovely venue, hosts local evening SJ series, and Dressage Series and has a couple of ODE's coming up. You can hire the xc course which is awesome! Beast and I are off there this evening for a spot of jumping
Actually its worth saying if you need some nice understanding people for said showjump practice on a clear round etc head up to king sedgemoor they are lovely