It’s difficult to know what they’d go for if they havent actually been caught eating anything,
@ColinUK. When we moved in here, and discovered the previous owners hadn't left us with Vacant Possession, I was told to bait the trap with whatever they’d been going for in the house. After they’d eaten my sweet pea seedlings that were inside to protect them from the frost,(I was quite cross about that) they tried to make off with a cherry tomato I'd accidentally left out, so I baited the trap with bits of tomato and it worked a treat. I also sprinkled flour on the worktop, and watched where the footprints emerged from, so was able to work out where they were getting in, so I left the trap on their 'run' and when we seemed to have got rid of them, I blocked it off from outside.