none of my interior lights are working checked fuses there fine as anyone had same problem  

If the fuse is OK it could be the convenience unit. It is mounted under the dash near the pedals. Best get fault codes read.

would there be any codes there is not a light on dash and is that unit easy to replace/get too

would there be any codes there is not a light on dash and is that unit easy to replace/get too

 

There may be codes, comfort guff doesn't generally light the CEL for obvious reasons.

It's a bit of a pain to get to. You have to remove the lower dash panel. There is a guide on here somewhere I think.

Here you go. This is for brake light switch replacement but you remove the same panels http://www.briskoda.net/forums/topic/211083-diy-fabia-i-brake-light-switch-replacement/

where would i find it on here?

^ Just posted you a link. See above

This is what the unit looks like...

 

Couple of others with similar trouble in this recent thread; but no news from either yet on whether my advice has helped.