The return leg would be played at Wrexham's Racecourse Ground - deemed a more suitable location for a match of such magnitude. Over 18,000 were in attendance to see the likes of Gerry Duffy, Dave Walker, and brothers Keith and Mike Pritchard star for United in a 2-0 victory which saw their European adventure carry on into the second round.

The minnows from North Wales would meet their match at the next stage, being drawn against the then Czechoslovakian (now Slovakian) heavyweights SK Slovan Bratislava, with both games taking place within four days of one another in the harsh Mid-December conditions. Slovan were reigning Czech Cup holders and an experienced European outfit packed with internationals who'd reached the quarter-final stage of the previous seasons' Cup Winners Cup.

Borough put up a brave fight over the two games, losing out by the solitary goal in the 'home’ first-leg, again held at Wrexham's Racecourse Ground in front of a crowd of over 10,000, before eventually being outclassed on an icy pitch in Bratislava as Slovan ran out 3-0 winners on the night to clinch a 4-0 aggregate success.

It would be Borough United's only foray into Europe, and they could hold their heads high. Becoming the first Welsh club to progress through a round in a major European tournament is something that has seen the club take its place in Welsh footballing folklore, and continues to be a memorable achievement that the locals of Conwy, Llandudno Junction, and the surrounding areas take great pride in.

Following their European exploits, Borough United continued to be a successful side within the Welsh League North, consistently challenging at the top end of the division, though ultimately failed to regain the title once more. It should be noted that, on the back of their Welsh Cup success, Borough would take part in the English FA Cup on four occasions between 1963/64 and 1966/67. Their first entry saw them reach the Second Round proper before being eliminated by New Brighton. Subsequent campaigns, however, would see Borough exit in the early qualifying stages, beaten by Ellesmere Port, Colwyn Bay, and Oswestry respectively.

1967 arrived, and would ultimately be the beginning of the end for the cherished Borough United. Landlords of their Nant-y-Coed ground, the Irish Oblates of Mary Immaculate order (a religious group within the Catholic Church), chose to issue the club with an eviction notice.

Whilst a new home was sought, and potential mergers with the likes of Colwyn Bay and Llandudno were considered, nothing came to fruition and Borough United were forced to withdraw from the Welsh League North. The club would soldier on somewhat nomadicly in the local district Vale of Conwy League for a couple of years before completely folding in 1969.

These days a reformed Conwy Borough and Llandudno Junction reside in the Welsh third and fourth tiers respectively. Both clubs were re-established in the mid 1970's in an attempt to bring back competitive football to the area, though Conwy Borough were initially called Conwy United (until the 2012/13 campaign), whilst Junction were initially called Hotpoint FC, then Llanfairfechan Athletic before regaining the name of Llandudno Junction ahead of the 1999/2000 season.

Indeed, European football would briefly return to the region in the summer of 1996 as Conwy qualified for the Intertoto Cup, where they'd face the likes of Denmark's Silkeborg and Charleroi of Belgium.

Though it's the charming, yet brief fortunes of Borough United that remains a jewel in the Welsh footballing crown. A story of achievement, local pride, and sheer determination and community togetherness that saw a part-time football club go from playing the likes of Holywell Town, Bangor City, and Caernarfon Town to taking on some of Europe's finest.