"No pressure but the Manic Street Preachers have turned up in the box to watch me work!!" tweeted Shane Williams this morning.
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Shoppers who don't bring their own bag will need to buy a bag for life costing 8p or 10p.
The RNLI say 17 people lost their lives last year around the Welsh coast.
The Don't Be a Lobster campaign uses brightly coloured signs to remind everyone to look after their skin in the sunshine.