A quick question, if you suddenly get a craving for, say, some chocolate or cheese for example, how would you say, ´I really fancy...´

Thank you

I think ´.....içi çekirim´  or ´.....heves edirim´ are two of the ways you can say this.

A small correction. we can say for that situation "caným çekti" or "caným istedi" and we have an idiom which "Aþermek". That idom use by  pregnant women. 

"Heves etmet"  a little bit  different. it means "to want something or do something but without passion.

Thank you both very much . Just so I know how to put the sentence together, how would I say for example, the sentence,

´I really fancy some pizza right now´ ???

 you can say;

"Caným þimdi pizza istedi"

"Caným pizza istedi"

"caným pizza çekti"

Brilliant Thank you

You are welcome. Afiyet olsun

 For me it would be "I fancy A pizza" (not some pizza, as it sounds like it is not enough) 

 Caným BÜYÜK BOY pizza istiyor!