Trustee with a criminal conviction

I know S36 of TA 1925 will allow a trustee to replace a trustee who has become unfit to be a trustee. My question is, if an existing trustee is happy to work alongside another trustee who has a criminal conviction for fraud, does the existing trustee have to replace them, or can the trustee with the conviction continue to act as a trustee?

Sarah Kennedy
GHP Legal