xj61986

Hi, the headlining on my 1986 XJ has sagged. I had it repaired once (I think they just stuck it back to the board) but within a couple of days it sagged again. How can I get back to the original state? Is that possible? Can it be repaired, or do I need to find a spare headlining and install that instead? If anyone knows an upholsterer in south of England that can do this let me know. Thanks