Mr Mackay slammed the door shut on his rivals to initiate a 16.5-1 double for jockey Sam Twiston-Davies and trainer Nigel Twiston-Davies at Huntingdon Racecourse on Tuesday, October 10, when enhancing his sale value with victory in the Racing TV Maiden Hurdle. 

The four-year-old, named after a prison warden from the hit 1970s BBC sitcom Porridge, put his assured race fitness to good use when building on a satisfactory debut over hurdles at Worcester last month in the extended two-mile three-furlong contest. 

Drawing clear of odds-on favourite School Days Over rounding the home turn, the gelded son of Mount Nelson bounded on over the final two hurdles before passing the post with three and a half lengths in hand to open his account at the sixth attempt of asking.

Sam Twiston-Davies said of the 4-1 winner, who is also owned by his dad Nigel: "He had a recent run at Worcester, and he took a blow there, so he had fitness on his side. 

The Hunts Post: Jockey Sam Twiston-Davies also won his race riding Ballintubber Boy, for the horse's fifth win at the age of six.Jockey Sam Twiston-Davies also won his race riding Ballintubber Boy, for the horse's fifth win at the age of six. (Image: Francesca Altoft Photography)

"I think both the step up in trip and that nice ground has helped him. They weren't going very quickly, so I put some pressure on in the middle part of the race as I knew he was very fit and that he has a good attitude. 

"He is still getting to grips with it all, and he is still growing up, but he jumped well and, hopefully, will keep progressing. 

"He is owned by Dad, so he is very much for sale."

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The father and son team completed their brace after Ballintubber Boy left two non-completions behind him when making all in the Clive Graham Memorial Handicap Hurdle. 

Having pulled up on his previous two starts, the 9-2 chance dictated matters from the outset in the three miles and one-furlong contest, which he claimed by three and a half lengths. 

Sam Twiston-Davies said: "You never know what you are going to get with him as he decides himself. 

"He does like to be on the front end, but if you force him, he doesn't travel. He does jump well on a going day. 

"Something like a Pertemps qualifier would be too competitive for him, and he would probably down tools. 

"That was his fifth win, and he is only six. We will probably try and jump him over fence.

"We tried him over one before (at home), and it didn't quite work out as we hoped, but as he is a bit more grown-up, it might be different next time."