(1) Subject to this Act, an allowance ("disability allowance") shall be payable to a person -

(a) who has attained the age of 16 years but has not attained pensionable age,

(b) who is by reason of a specified disability substantially restricted in undertaking employment (in this Chapter referred to as "suitable employment") of a kind which, if the person was not suffering from that disability, would be suited to that person's age, experience and qualifications, whether or not the person is availing of a service for the training of disabled persons under section 68 of the Health Act 1970,

(ba) subject to subsection (10), the reason for whose substantial restriction in undertaking suitable employment is as a direct result of the person concerned being incapable of work and for no other reason,

(bb) who, were it not for the substantial restriction, would be available to work in insurable employment or insurable self-employment,

and

(c) whose weekly means, subject to subsection (2), do not exceed the amount of disability allowance (including any increases of that allowance) which would be payable to the person under this Chapter if that person had no means.