Wow i knew they could be picky eaters, but i didn't realise to that extent.

the current (and broken ritual) used to be:

1) thaw the ratpup in a open plastic tub next to the viv for him to smell (usualy thawed for 12 hrs)
2) place the ratpup in a plastic sandwich bag (supposidly to preserve smell)
3) place bag in warm water to warm mouse up

Then try to feed.

I'll contact the store and get his feed ritual off him down to the little details.

Thanks everyone for your great advice