it disenfranchised shedloads of people living abroad (and therefore likely to vote Remain) because their postal ballots arrived late. Purely coincidentally, the postal vote was outsourced to a private company run by an arch-brexiteer.
LA Counting Officers were responsible for sending out the ballot papers. Some LAs had contracts with IDOX, some didn't, so I'm not sure what point you are making unless it's that some LAs decided to use that company because Peter Lilley was a Director and they wanted a leave vote? I dont think it quite works like that.
Some postal votes didn't arrive (the Electoral Commission said they had 52 enquiries), but many more were incorrectly completed, not returned, or people didnt take up the proxy option which is what was advised if their ballot papers hadnt arrived in time. The outcome of the vote cant be blamed on this.