"Regardless of whether it was rain, hail or snow Zak would be standing there with that cheeky smile on his face that he was so well renowned for.
"He was an absolute pleasure to be around.
"Zak's positive attitude to life is something that I will try to incorporate in to my life, for the rest of my life.
"Farewell my brother."
Another colleague, Scott Kerr, said it filled him with sadness, frustration and at some times anger that Bhuiya had been "so cruelly taken".
But he was choosing to focus on what Bhuiya had taught him in caring for others, that laughter made everything easier and that all people shared the "universal language of mischievous fun".
"I feel honoured to have had the opportunity to work alongside and be friends with a guy with such beautiful morals and such a brave outlook on life," Kerr said.
"He was a really honourable ambassador for Muslims and I'll never forget him or that Bollywood dancing of his."