Thank you for the way you've pursued this issue. I can confirm that everything that you say factually is correct. The activity of Cadw in controlling feral pigeons is permitted under a general licence derived from the Wildlife and Countryside Act 1981, which, as you say, is issued by Natural Resources Wales. Cadw have trialled a number of ways to control feral pigeons in the past, including using localised netting, blocking up holes in historic fabric—which, I'm sure you appreciate, is rather difficult—installing anti-perching spikes, using ultrasound, lifelike plastic deterrents and even birds of prey. These have not proven as effective as they would have wished, but I can not only confirm that the activity that Cadw undertook was legal, but in view of the concern that has been expressed by you today, and, indeed, by members of the public, Cadw has agreed to undertake a review. They assure me that this review will take place urgently, and that no further activity of the kind that you describe will take place until that review is completed. The review will include detailed advice about the environmental and the public health aspects of the control of feral pigeons, and I will certainly involve you and any other Members who are particularly concerned about these incidents in the discussions, after the review is completed.