Pilot Biddulph and brakeman James Lelliott made up for a sluggish two-man bobsleigh first run of 54.87seconds with a storming second of 54.54 to give them an overall time of 1:49.37.
That put them in the medal positions for much of the second round but, in the same city where Britain won their first ever bobsleigh gold all the way back in 1964, history failed to repeat itself.
Biddulph and Lelliott finished just one-tenth-of-a-second shy of the podium as they ended up fifth, but Biddulph admitted that a top-five finish was more than they could have dreamed of heading out to Innsbruck.
“It was unbelievable, it was absolutely unbelievable,” said Biddulph.
“We wanted to come in the top six so we are more than happy with that. We got a personal best for our race time and a personal best for our start so we are delighted.
“We got one of the quickest rides in the second run, we gave it everything and went as well as we ever have so we are happy.
“We missed out on a medal by a tiny amount but that is bobsleigh at the end of the day and we are happy with how we did.”
Biddulph, 19, and Lelliott, 18, were part of a 24-strong British team and, despite them narrowly missing out on a medal, there was something to celebrate on the final day in Austria.
Training partners and teammates Mica McNeill and Jazmin Sawyers stormed to silver in the two-woman bobsleigh and Biddulph was full of praise for the duo.
“We are so happy for Jazmin and Mica as well, they totally deserve that silver medal, they have been fantastically dedicated all the way through,” he added.
“They have done amazingly well and with the other British girls coming fourth as well we have taken second, fourth and fifth, that’s not too bad for a nation that doesn’t have snow.
“It feels great to have taken the team out on a high on the final day, we can’t complain with fifth at an Olympics can we? It’s a great result.”