>>>Been told I should not be using them
It's illegal to manufacture and wholesale them but you can continue using the ones you've got.
>>>None of the new low energy bulbs come close to the brightness of a 100 watt bulb
Rubbish. While some '100W equivalent' bulbs (which typically consume 20W) might not appear as bright as 100W tungsten bulbs, there's nothing to stop you buying, say, a '150W equivalent' bulb (which uses around 30W) instead. That will definitely be bright enough and still result in around 70% energy saving.