Marianne Gunn's verdict: Three stars

Supporting the Backstreet Boys on their 20-year anniversary UK tour, the four members of All Saints looked more nonplussed to play the Hydro than "honoured" as they suggested to the audience.

Vocally they still sound (mainly) fine but the original choreography now looks very dated. Under the Bridge, their most successful cover, was followed by a whistle-stop tour of their hits: harmonious Black Coffee, anthemic Never Ever and seminal Pure Shores.

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What they lacked in dynamism they failed to make up for in charisma, however, with Blatt and Lewis sharing a little personality, unlike the perpetually lacklustre Appletons.

The Backstreet Boys, who toured with New Kids On The Block last year, are back for another bite of the (pensionable) cherry.

The staging within the Hydro was impressively lavish with a now typically-coveted premium area around the walkway.

Nick Carter, certainly the fans' favourite, was distinctive during the opening numbers by his black leather gloves, an odd conceit with his light blue sharp suiting.

Songs from their most recent album 'In a World Like This' opened the show, with some rocky musicianship most unlike their 'boy band' material.

In cutesy fashion, AJ McLean brought his little girl onto the stage to see "all of their Scottish relatives" (his family are from Mull) and he later showed off his full regalia tartan purchases.

As Long As You Love Me and Show Me The Meaning of Being Lonely led Kevin Richardson to speak about partying like it's 1999, going down his own memory lane and reminiscing about the 1995 Smash Hits roadshow in Glasgow.

The Boys seem to have (just about) survived the excesses of fame and appeared genuinely delighted to be among their Scottish fans, although whether they will still be performing 20 years hence (as they suggested) is quite a thought.