BAFE are unable to comment on particular fire extinguisher models/products available on the market. For the BAFE SP101 Scheme however, products shall be required to meet all requirements of the relevant/current British Standards as outlined within the BAFE SP101 Scheme Document (i.e. BS 5306-3, BS 5306-8, BS 5306-9, and BS 5306-10).
BAFE have published a position statement to help clarify this matter which is available here: BAFE position regarding any products falling outside of BAFE SP101 Scope
For Information the British Standards referenced above are: