Two Ike Ugbo goals secured his Young Lions a 2-1 win at Burton Albion on Thursday against Romania, ensuring top spot in the group after their previous victories over Norway and Slovenia.
The result also ensured that for the second consecutive year, Peacock’s sides have reached the finals with six successive qualification victories.
England 2-1 Romania
UEFA European U17 Championship
Elite Qualifying Round
Thursday 26 March 2015
Pirelli Stadium, Burton
"Yes, it’s quite nice that, and long may it continue," Peacock told TheFA.com.
"They could have taken their foot off the gas a little in the last game but they didn’t. I’m very strong on the team having a winning mentality and continuing momentum. They set their standards and they have to keep maintaining that.
"I don’t think they could have done anymore than win the three games – it’s been great."
He added: "I told them afterwards that since they first arrived ahead of these games they have been very focused. Results don’t come cheaply and you have to work hard for everything and they’ve done that.
"We now have to take that into the finals."
England’s second group match at the tournament in Bulgaria will mark Peacock’s 100th in charge of the Young Lions in European competition.
The two-time Championship winning coach is naturally looking forward to reaching such a milestone, but he is more interested in what the experience will do to his players.
"I’m very much looking forward to it. It’s very nice to be back in the finals again, but more importantly though, it’s good for the players," he explained.
"The staff have been lucky enough to experience a few over the years, but we get a new group every year and this is a great challenge for them.
"I think they will enjoy it enormously – but they’ll like it even better if they keep winning."