PhD studentships sponsored by industry usually have a slightly higher salary. So you could expect to start at about £20-22K. Post-docs in industry start at £26K, if your good that could go to £29K but that's the high end of the scale esp. if your coming straight from PhD, more likely to get that if you've already done ~2yrs post-doc. Depends on the position largely. If you are thinking of post docs, and doing so in industry, the Marie Curie fellowships pay well and you qualify for the benefits that regular full time employees get.