Numis Securities are a joint corporate broker to SAVP.
I assume they are paid a fee or retainer so their independence may be questionable.
As for their credibility and reliability, they seem no better or worse than the herd.
From their own website:
Listed on AIM and with offices in London and New York, Numis has grown to become one of the UK's most respected institutional stockbrokers and corporate advisors. We employ circa 200 staff, and the group is listed on AIM.