Interesting point, Skyhigh. I'm afraid I can't help with your specific query but I wonder whether the CAA gave a reason?
Now that they've made birdstrike reporting mandatory one might ask what they are doing with the data? Is there a valid reason for not releasing it under a FOI request?
As niknak says, you could try asking the airport but I suspect that they would see it as potentially commercially damaging -a bit like hospital league tables, you could twist the raw numbers in any way that you choose. And, of course, what if BHD had 5 strikes in 2007 and other airports won't say - is BHD a safe airport.....?
I don't know why you want the data but as the requirement for aircraft operators to have a Safety Management System is implemented requests for data like these could become common - it could be argued that is is detrimental to safety to withold the information....be it the CAA or BHD that does the witholding.