First things first. Congrats on not getting the job at PA. Better to take a PA to the knee than mediocrity to the brain.
So if you are helping this medical devices company on a new product they want developed you can apply yourself commercially, and with a real degree in a real subject and refreshing honesty, I think young man you will go far.
But you need to rethink your parameters. Exactly what do you want to do in Life Sciences? Does it have to be LS? How about more overlapping issues onto LS such as customer, pricing, NPD and innovations, finance and portfolio management, marketing, regulatory, market access etc etc etc. Think laterally - all you need now is a start in a good firm, the rest is inevitable.
LS as a consulting sector is a bit awkward in the UK at least, due to consolidation in the consulting sector which has swallowed up some of the brightest lights of LS consulting. Detoilet gave you a list, add maybe IMS, ZS Associates for a more niche focus. As for the Big 4 and the like, they may not give you a direct route to apply to their LS business, but sure enough you will either be directed there once adequately bootcamped, or gravitate there anyway if you were to join them. Have a little faith in yourself BioPaul.