Risk assessment was flawed as it failed to even consider the scenario that ungrooved parts of the runway were a hazard in wet and windy conditions despite the fact that these conditions could have reasonably been forseen to occur at Bristol in any normal winter (both Belfast City and Luton considered such risks and the contractor was aware of such a risk).
Rumour has it that despite being told about pilot reports re-aquaplaning prior to any of the incidents in the report, a senior airport manager denied that this could occur and that the pilots concerned didn't know what they were talking about. Mind you, it's only a rumour and this is a rumour network.