Stair Lift (Curved)

Hi all, I need any advise or information on stair lifts (Curved) you can give me i.e makes,price,problems,grants etc. My folks are 81 & 83 and one of them has fallen into ill health.

Thanks.

Reminder that recommendations for suppliers may only be sought or given in the Recommend tradesmen and suppliers forum, so please don't post these to this thread.
Leo