14 Her Honour accepted that such helmets have only rarely been seen worn by players of indoor cricket. Among the witnesses upon whose evidence her Honour relied was the Mr Lewis referred to in the ground of appeal, who himself, as her Honour noted, was an owner and operator of an indoor sports centre, Vice-President of the Australian Indoor Cricket Federation, the regulating body for the playing of indoor cricket, and, in his capacity as an owner of an indoor sports centre, a director of the WA Indoor Cricket Federation, a group comprised of the overwhelming majority of the owners and operators of such centres. It is clear that her Honour accepted this witness as having considerable knowledge of and expertise in the game of indoor cricket, and in my opinion she was perfectly entitled to do so and to rely upon his opinion. She did not overlook any of his associations with the owners and operators of indoor cricket courts, but she nonetheless accepted his evidence.