Insect/Mosquito Repellent when pregnant

Hi there, I don't ask too many questions as it appears that all topics are covered. I couldn't find anything about insect/moquito repellent. I am off to Spain at the weekend and Doctor told me to avoid "Deet" in repellents. I called into Boots yesterday and they have only one spary which says ok for pregnant women and it contains "Deet"!!! Any suggestions as the unfortunately the f**kers always find me and have a great meal. I have called the hospital and am waiting on them to come back to me with suggestions. Does anyone have any suggestions?

Have you ever tried tea tree oil lotion? My sis gets eaten alive and finds that tea tree lotion works for her. Also increasing amount of vit B in system (eg. marmite) also has worked for her though I'd be abit reluctant to ingest more vitamins now.