The latest of those came this weekend as the 27-year-old, who featured in all three Lions Tests against Australia in 2013, led Ospreys to the top of the table with a 22-11 victory over his former side Newport Gwent Dragons.
And Tandy admits he is delighted at the speed with which Lydiate has found his feet back in Wales.
"His ball-carrying is coming and he's a great character. Dan has been driving standards and I think he's getting better.
"We are delighted with him and it's great to have him here."