I think one of the problems is the cost of getting an exemption from the ANO - certainly for flour bombing, not sure about balloon bursting.
It used to be relatively cheap, but the costs ramped up.
We used to have these at the Hucknall fly-in each year, I don't know if there are plans to resurrect it.
I know one club at Wellesbourne that does flour-bombing (at another airfield).
I believe Henstridge occasionally marks out a "carrier deck" on the runway for spot landing (i.e. touching down short is a 'fail')