But all four are carrying plastic bags. One contains coke, another snacks, but two contain bottles. Vodka, three in all, tissue barely concealing the labels, booze clearly newly bought, judging by the wrapping and the pristine white plastic bags.
From where? By whom? By my reckoning, the four are 14 to 15, no older than 16.
What of the Challenge 21 initiative, ensuring traders challenge all who look younger than 21, let alone 18?
Some supermarkets have raised the challenge to 25. Draconian? It's better than watching kids fall over drunk when most should be studying for exams.
Little more than an hour later, this little lot are drunk, boozily smooching and fumbling, running wild in a spot often used by the local down-and-outs, diehard older drinkers.
The consequences of binge drinking are evident in Blackpool, with drink-fuelled violence, yobbery, thuggery, vandalism and anti social behaviour spilling on to streets and into headlines. But it's across the Fylde.
Deaths from alcohol-related causes have doubled in a generation. Around 43,000 men and 28,000 women are admitted to hospitals in the North West every year for an alcohol-related condition – around one person every seven minutes.
There's the link, as our fumbling foursome underline, with teenage pregnancy. And the separate issue of older predators plying kids with drink.
The Government has vowed to stamp it out before it wipes out more young people but how?
One of the Fylde's police chiefs, Inspector Keith Ogle (below), wants it to begin in the home. Much has been made of Chorley police ferrying drunken kids back home to parents who may, or may not, give a damn, but a similar system was pioneered in south Fylde and continues in Blackpool.
St Annes police patrolled with a nurse who reminded parents of their responsibilities. She found many resented the slur (in every sense) on their parenting skills.
Insp Ogle knows enforcement only goes so far. Western division also has an alcohol harm reduction officer, working with Blackpool Primary Care Trust, to inform, educate and offer age-appropriate advice to persuade kids to think again – while they've still got brain cells functioning.
From this week, police are out and about anew, patrolling parks, beaches, public places, confiscating alcohol from kids as summer boozing heats up, escorting inebriates home, hoping parents will play their part.
I spot six more teenagers on Cleveleys Prom. It's just after 6pm, still sunny, and as elderly couples promenade and families play, the teenagers sit in a shelter and swig strong lager, hurling the empties away, urinating openly, voices louder, more abusive, the more they knock back. At their midst is an older man. Who bought what
– and why?
That's what Insp Ogle aims to find out. Further crackdowns on under-age sales are planned at off licences and other outlets.
"We already do more test purchasing here than nationally and are infinitely more proactive in terms of purchasing in pubs and off licences," he said.
"Blackpool's the big one. There's this perception it's a stag and hen party town, that you come here to drink and get drunk and it's acceptable.
"That culture's prevalent among 14, 15 and 16-year-old youths, getting the booze directly, finding someone older to buy it, or getting the stuff from parents.
"We work in partnership with parks and leisure staff, taking the booze, disposing of it, and taking the kids back to parents. That starts in July. It's backed by test purchasing at off licences where, intelligence tells us, problems exist.
"We did 50 a month ago, got 18 positives, people selling to under-age buyers, but we want tougher penalties. In court the maximum fine is £5,000. Sometimes it's inexperience, lack of training, but we can review that, take licences away and shut places down rather than just suspend operations.
"Our alcohol harm reduction strategy sees kids get appropriate information on effects, short-term, anti-social, long-term.
"Tell a 14-year-old that, if they drink, they reduce life expectancy by four years below the national average and it doesn't mean a thing. They think they'll live forever.
"Get a make-up expert in to say, look, this is what drink does to your skin, when you're 20 you'll look 28, and it begins to matter.
"We work with supermarkets, too. I was 21 when I started on lager but it was three per cent proof, not more than five per cent as it is today, and even wine's more alcoholic than it was.
"We also need to reach dads who buy, say, 54 cans of Carlsberg to stick in their shed, rather than store it where kids can't reach it."

jacqui.morley@blackpoolgazette.co.uk