Some interesting info about natural insect repellent herbs and plants here
Natural Insect Repellents
Which? guide to insect repellents
Types of insect repellents - Insect repellents - Archive - Which? Home & garden
Avon statement on their website with regards to Skin So Soft
"I have heard you can use Skin So Soft as an insect repellent is it true?
We have had reports from Representatives and their customers that Avon Skin So Soft Soft & Fresh (originally Woodland Fresh) fragrance Bath Oil and Dry Body Spray acts as an effective insect repellent. Our Quality Control Department advise that it is the aroma of the product that has this effect. Citronella is in the perfume and as fragrance oils are 'propriety compositions' and the property of the vendor, due to vendor confidentiality, we list this ingredient as Parfum. However this product is marketed and sold by us as a bath preparation only. We would not recommend any Skin So Soft product for any other use. Skin So Soft products in any other fragrance do not contain the same ingredients as Soft & Fresh. "
So it seems that if you eat plenty of Marmite and Garlic, drink nettle tea, douse yourself in citronella and lavender, treat the bites with vinegar and tea tree and chamomile, that should keep the midges away although it'll probably keep most humans away too