>>> Did the forms say that they would do a CRB check on you? That's pretty standard these days, even for voluntary work, especially if you're going to be in any sort of contact with the public.
Since the legislation was tightened up, many organisations who used to require CRB checks (which have now become DBS checks) are no longer able to do get them.
Royal Mail, for example, used to insist upon DBS checks for all of their staff and used a dubious 'back door' route in the legislation to ensure that they got them.
The law has now been tightened to make it a criminal offence to try to get a DBS check carried out on an applicant for employment (or for a voluntary position, etc) unless the type of work/activity is 'exempted' by the provisions of the Rehabilitation of Offender Act 1974.
In effect that means that the work/activity has to fall into one of the 61 categories listed here:
https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/519060/Guide_to_eligibility_v8.1.pdf
So it would be a criminal offence for the organisers of the local food bank to try (through a 'back door' route, since there's no 'regular' one open to them) to get a DBS check carried out on Nailit.
[NB: The above doesn't apply in Scotland, where there's a 'basic' level of criminal record check available to any employer or voluntary organisation who wants to make use of it. However such a check only shows unspent convictions anyway].