Don't know where Holdens Farm is but there is an organisation called South Manchester Ringing Group who might be able to help and might want to take the site under their wing if access is straightforward

Hi Jack,

We generally ring Swallow chicks where they are accessible - I'd be happy to speak to you about this, if you want to give me a ring on 07984237822.

We seem to have more swallows than ever this year At Holdens Farm. Someone from I think the RSPB used to come and ring the young, they have not been for 7 / 8 years do they still do it ?
If so who do I contact please ?