This came up here recently. The only issues I know of are that the DfT will give aerial work permission under ANO article 140 (basically this applies only to the pilot receiving paid training) to people who are owners or part owners in a group no larger than 4 people, with similar provisions for Ltd companies. It's on the DfT website somewhere. But if nobody needs any training, or they can find somebody to do it without being paid, or they can do it outside UK airspace, then this is a non-issue.