There aren't vast numbers of Focusing teachers in Britain, but there are some.
Some teachers have both qualifications.
Not having an official qualification does not mean that a person cannot teach Focusing. The philosophy in the Focusing world is generally one of live and let live. So you might come across someone who can teach you about Focusing who doesn't have either of the above qualifications. There is also a system of accreditation organised by the Biospiritual Focusing community.