Please.

where in cardiff city centre or outskirts,there is a good chain of indians very good called the spice merchant, one in city centre by the new theatre and one down the bay, both great really nice food

There's so many. This is a useful guide.
http://www.bigcardiff.co.uk/cardiff-restaurant-guide.php?start=0&batch=20&action=summary&category_id=0

Ones I've been to and can recommend are.
Armless dragon ( For something welshish )
Bay Leaf
Bullys
Continental
De Courcys
Diner 77 ( best burger place )
Giovannes
Huntsman
India gate
Juboraj ( any of them are about the best Indian in Cardiff )
La Brasserie
La Fosse
Little oriental Bistro
Merolas
Zio Pin ( whitchurch, now called Villigano Mediterano,or something like that )

If your having a skinful first and love your steaks, try Charlstons

http://www.tripadvisor.com/Restaurant_Review-g186460-d789895-Reviews-Charlestons-Cardiff_Southern_Wales_Wales.html

Ended up in a micro brewery – Zero Degrees on St Mary street.
Black Lager – bloody lovely (hic)

Best curry = Mint and mustard

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don't listen to jezdavies he's clueless!!!

No mint and mustard is good, as is cibo's for italian-yum! MMMMM calzone.