“The choir delivered, we were good in there,” added Warburton.
“We have put a lot of practice in behind closed doors and it has been good fun from a bonding point of view and we have had a laugh.
“But the guys have also actually really bought into it and from the English, Irish and Scottish boys point of view, to learn Calon Lan is really impressive.
“The Welsh guys were thinking ‘Crikey, this is going to be difficult’, so to learn it and buy into it has shown how the lads have come together off the field.
“We must have had at least 10-15 choir practices and hopefully paid off in there.”
Next up was a first trip to Eden Park to take on the Blues of Auckland. In another hard-fought encounter, star backs Rieko Ioane and Sonny Bill Williams powered the hosts to a famous win.
CJ Stander’s first-half try and the boot of Leigh Halfpenny had looked like they might be enough to hold off the Blues but in the end a classic Williams offload released a flying Ihaia West for a superb try and the Blues became the first-ever Kiwi Super Rugby franchise to defeat the Lions.
Next the Lions travelled to the South Island where the Crusaders of Christchurch lay in wait.
On arriving in the city, Tour Captain Warburton, Head Coach Gatland and Tour Manager Spencer were among a group of Lions representatives who paid their respects on behalf of the entire squad to the victims of the Christchurch earthquake by visiting the Canterbury Earthquake National Memorial.
The group laid a wreath at the site which was created to remember the 185 who sadly lost their lives during the 6.3 magnitude earthquake which devastated the region in 2010 and 2011.
On the field, the Crusaders were expected to provide one of the bellwether challenges of the Tour.
Unbeaten all year and top of the table in Super Rugby – they would go on to claim the title in July – the Lions needed to produce their best at the AMI Stadium.
And they delivered it with one of the stand-out performances of the Tour, a statement of intent that gave the group much-needed momentum with the pack creating a platform for a 12-3 victory.
An unfortunate Tour-ending facial injury to Stuart Hogg and the use of Farrell and Jonathan Sexton as twin playmakers in the second half – a foreshadowing of things to come – were the other points of note.
Dunedin’s Forsyth Barr Stadium, also on the south island, was next up for the Lions to take on the Highlanders.
A pulsating encounter under the closed roof eventually went the hosts’ way, a late penalty from Marty Banks proving decisive. The Lions could take heart from the attacking potential shown as Warburton, Jonathan Joseph and Tommy Seymour all crossed for tries.
The following Saturday, a much-anticipated clash with the Maori All Blacks followed and once again, the pack was able to dominate proceedings and establish the platform for an eventual 32-10 success.