Brit Drag make both 5mg and 50mg tabs
5 mg tablets are yellow hexangonal tablet with a score on one side and plain on the reverse.
50 mg tablets are yellow hexangonal tablet with a score on one side and '50' imprinted on the reverse side.
Standard dosage is 50mg ED i would not expect to see much on a 30mg Winny ED cycle no matter what make they were. As for your source giving you wrong information then i would find a new on.
Wrongun!