Its becoming very popular of late, for homeowners to look at repairing a conservatory rather than totally replacing one. Cost is obviously a factor in play here, but there is also less intrusion into family life and in many cases it is a more sensible solution than a full replacement.
Conservatory roofing is a complex area and you need to be well aware of the pros & cons of going this route before you part with any money.
But if you are really determined to get a new look for your old conservatory roof, then you can find lots of information here: https://www.lowcostconservatory.co.uk/replacement-conservatory-roof-cost/