5 mile chain life?

I was going to put this in the MTB forum, but the bike hasn't been used off road apart from round the local park pitches.
The other night I bought a brand new Rockrider 5.3, rode it home (two miles) then round the local park pitches for a while, went out this morning before work, just ambling along (sub 10mph) and there two clicks and no drive, the chain has broken, one link has pulled the pin out of the sideplate. Now I have a powerlink in work that someone gave me and I'm wondering should I take the bike back, which as I don't have a car would involve borrowing one off the boss, or just fit the powerlink and put it down to back luck?
As the bike is no longer pristine, would they claim the old "rider abuse" get out?
The other night I bought a brand new Rockrider 5.3, rode it home (two miles) then round the local park pitches for a while, went out this morning before work, just ambling along (sub 10mph) and there two clicks and no drive, the chain has broken, one link has pulled the pin out of the sideplate. Now I have a powerlink in work that someone gave me and I'm wondering should I take the bike back, which as I don't have a car would involve borrowing one off the boss, or just fit the powerlink and put it down to back luck?
As the bike is no longer pristine, would they claim the old "rider abuse" get out?
Disc Trucker
Kona Ute
Rockrider 8.1
Evil Resident
Day 01 Disc
Viking Derwent Tandem
Planet X London Road
Kona Ute
Rockrider 8.1
Evil Resident
Day 01 Disc
Viking Derwent Tandem
Planet X London Road
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Parktools :?:SheldonBrown
Kona Ute
Rockrider 8.1
Evil Resident
Day 01 Disc
Viking Derwent Tandem
Planet X London Road
Orbea Aqua TTG CT 2010
Specialized Secteur Elite 2011
Mind you, a powerlink is a permanent fix if you can't be bothered. You're just running the risk that the rest of the chain is defective too.
retired 9.6kg Carrera Kraken
The Carrera Hardtail combined thread - come on all you Carrera's!
The Sons Scott Genius RC20 build
How have you managed to de-pristine a bike in 5 miles? My commuter is near pristine after 5000 miles
Plus one to the 'carry on riding it' approach. The most you should ask for is a free quick link to give back to your colleague.
Very easy to de-pristine a bike round that park!
Anyway, didn't bother going back near them, bought the guy who gave me the powerlink a pint and he tried the bike, came back shaking his head then set to work on the brakes, miles better!
Kona Ute
Rockrider 8.1
Evil Resident
Day 01 Disc
Viking Derwent Tandem
Planet X London Road
retired 9.6kg Carrera Kraken
The Carrera Hardtail combined thread - come on all you Carrera's!
The Sons Scott Genius RC20 build