Just now noted on a favourite on-line auction site a "Borough of Portsmouth silver tribute medal to the Naval Brigade". Item 321889948165. Never actually saw one of these for sale before (excellent illustrations of obverse and two reverse types in "Boer War Tribute Medals" by M.G.Hibbard).
Unfortunately, I don't think my "Terrible" chap would have been given one - as he had been posted to HMS "Redpoll" for China service instead of remaining on HMS "Terrible". However, one of the forum members might find the item of interest.
Regards to all
If you are still looking, Sahpa, here is one coming up at auction next month
Picture courtesy of DNW
Borough of Portsmouth Tribute Medal 1899-1900, obverse, shield, ‘Borough of Portsmouth’, reverse engraved ‘Naval Brigade, South Africa 1899-1900; North China 1900’, unnamed, 27mm, silver (Hallmarks for Birmingham 1902) and enamel