I thought I'd share with you my top three...
First up is Aromatherapy Associates Deep Relax bath and shower oil.
Aromatherapy Associates' most famous, multi-award winning, 25 year old bath oil really is worth the hype. With Sandalwood, Vetivert and Camomile, it is so soothing and relaxing. While a bottle is expensive at £37 for 55ml, one capful is more than enough, so it will last you a very long time. I'm just finishing off my bottle after 6 months or so (and about 25 baths!)
Another favourite of mine is Jo Malone's Pomegranate Noir.
Much more of a fruity scent (if you couldn't tell by the name!) this one is great if you really feel like indulging. It's not as potent as the Aromatherapy Associates, but it's rich and delicious and you get a lot more for your money (£38 for 250ml)
Finally, one of my favourite ways to try out new bath oils is by buying miniature collections.
It means you can effectively try before you buy the more expensive bottles and I've been loving Neom's mini bath and shower oil set. It's got five miniature 5ml bottles, each enough for about two baths and including 'Real Luxury', 'Restore', 'Tranquility', 'Refresh' and 'Complete Bliss' all for £15.
Disclaimer: I bought the AA & Jo Malone, the Neom was a press sample.