'She said while Brexit might solve the issue of the disallowance fines from Europe, the more immediate problem of farmers "is down to the British government" and its failure to implement a fit-for-purpose IT system.'
I thought one of the facets of Brexit was that we'd be out of the CAP, farmers won't get any more payments, they won't be able to recruit cheap foreign migrant labour* and will go out of business so the IT system for paying them simply won't be needed.
*They might be able to recruit UK migrant labour when all those businesses established here as an EU base for non-EU corporations close down.