Pension is NHS, so would be a little costly to give that up (nothing like final salary though, sadly missed that boat). Have full sickness and holiday benefits.
Sounds like you are an IT manager in the NHS been head hunted to work in the private sector x3 your current pay?
You would join countless others who have left, the NHS simply cannot afford to pay you what you can earn in the private sector, and your experience is something the private sector is fighting over, in your position I would even ask the company head hunting you for ADDITIONAL financial compensation to make up for lost NHS pensions.
It's the wild west current in digital transformational projects in the NHS. Everyone can see the need and potential, but the companies with technology simply don't have the clinical experience, and the NHS hasn't got a £ to pay for the IT skills needed.
You are in a very thought after position, don't under sell your self. You will also not going to be struggling to find a job, you know how the NHS works, 'transformational' projects takes decades if not longer.
A working/real life knowledge of the NHS environment + IT background + Project management experience is the golden ticket right now.