Without knowing whether an LLP is required to follow the same employment laws as larger companies, Citizens Advice Bureau states:
It is illegal for an employer to discriminate against you because of your sex. This includes all employers, no matter how few people they employ. Most workers, including employees, agency workers, trainees and those who are self-employed have protection from sex discrimination at work. This includes:
recruitment and selection
promotion
training, pay and benefits
redundancy and dismissal
terms and conditions of work
That said, countless bands advertise for gender-specific members, but they well be 'private' concerns with regards to employment. Don't know.
Why? Would you feel the same if a different male singer turned up?
Si