Whilst shopping in Holland & Barrett I saw the Dr Organic range made a Tea Tree Antifungal Nail Solution £5.19, which is exactly what I was looking for. It's sweet almond oil containing tea tree and undecylenic acid which are both antifungal and antibacterial. The bottle has a brush inside and you apply a thin layer to the nails twice a day.
The directions say that after three weeks the nails would be improved but this didn't happen for me and I lost heart after about four weeks when not a lot seemed to be happening. However, after a week I thought I should give it another go and so carried on for another three weeks when suddenly I noticed that yes my nails were definitely improving.
My nails have now returned to health thanks to this Antifungal Nail Solution. It took a lot longer than stated but in my experience with natural products they react differently to each person. I didn't have to go down the tablets route so it was all worth it in the end.