How long must a pregnant employee work for a company to be entitled to maternity pay?

How long must a pregnant employee work for a company to be entitled to maternity pay?
If they do not qualify for maternity pay from the company, are there other benefits they can claim?

Read
Section 5 of Maternity Benefits Act 1961.
Right to payment of maternity benefit
sub section (2)
(2) No woman shall be entitled to maternity benefit unless she
has actually worked in an establishment of the employer from whom she
claims maternity benefit, for a period of not less than 1*[eighty
days] in the twelve months immediately preceding the date of her
expected delivery:
Hope this makes it clear.
Always check original act for such basic queries.