Getting bf baby to take expressed milk

Hi - I have been bf DD for 10 weeks successfully, but now trying to get her to take a bottle of expressed milk so I can leave her with her dad for a bit. She used to take a bottle when she was 2 weeks old, but I stopped (thinking she would be able to pick it back up) and now of course she won't take it.I'm using TT closer to nature bottles and have tried the size 1 and variflow teats.

Any suggestions?

Thanks