I agree with G-EMMA, the crosswind join is as described on the CAA OHJ poster. As recently pointed out to me, the only problem with the poster is the start of the OHJ should be probably over the downwind numbers, not off to the side as it appears to show.
The only additional consideration is the length of the runway. If long, then the airfield may require you to bisect the runway for the reason that English Al identified.