Sonya, that link you posted is from a for-profit that is giving out bad information. This is from the Immigration and Nationality Directorate:
http://www.ind.homeoffice.gov.uk/ind/en/home/laws___policy/immigration_rules/part_5/section_3.htmlPERSONS WITH UNITED KINGDOM ANCESTRY
Requirements for leave to enter on the grounds of United Kingdom ancestry
186. The requirements to be met by a person seeking leave to enter the United Kingdom on the grounds of his United Kingdom ancestry are that he:
(i) is a Commonwealth citizen; and
(ii) is aged 17 or over; and
(iii) is able to provide proof that one of his grandparents was born in the United Kingdom and Islands and that any such grandparent is the applicant's blood grandparent or grandparent by reason of an adoption recognised by the laws of the United Kingdom relating to adoption; and
(iv) is able to work and intends to take or seek employment in the United Kingdom; and
(v) will be able to maintain and accommodate himself and any dependants adequately without recourse to public funds; and
(vi) holds a valid United Kingdom entry clearance for entry in this capacity.
I don't trust anything about immigration that isn't backed up from a government source. If you still want to say the Home Office is incorrect, that's your call.