I’ve just noticed that the Government amended the wording for Ground Rent demands (s.166, 2002 Act) on April 26, 2011 (see here: http://www.info4local.gov.uk/documents/publications/1905195). The change is in para. 3 of the Notes for Leaseholders.
It used to read:
“Section 167 of the Commonhold and Leasehold Reform Act 2002 and regulations made under it prevent your landlord from forfeiting your lease for non-payment of rent, service charges or administration charges (or a combination of them) if the amount owed is £350 or less, or none of the unpaid amount has been outstanding for more than three years.”
It has been changed to read:
“Section 167 of the Commonhold and Leasehold Reform and regulations made under it prevent your landlord from forfeiting your lease for non-payment of rent, service charges or administration charges (or a combination of them) unless the unpaid amount is more than £350 or consists of, or includes an amount that has been outstanding for more than three years.” (my underlining).
This is only in England, there doesn’t seem to have been a change in Wales.