A Siamese carp of a hundred kilos is not a bigger version of the carp in an English lake. It is a different animal that happens to share a family. They are broad, deep bodied, immensely powerful in the first thirty seconds and then very heavy for a very long time afterwards. The species record and growth data are held on the FishBase species page.
The fight is the part nobody prepares for. There is no sprint and no acrobatics. There is a slow, absolutely irresistible movement away from you that continues regardless of what the drag is set to, and it either stops when the fish decides or it stops when something breaks.
They are caught on the same float and feeder set up as the catfish, which is why so many people hook one by accident on their first morning. That is usually how it goes wrong. Tackle that will land a forty kilo catfish is not necessarily tackle that will land a carp three times that weight.
Handling matters more here than with anything else in the lake. These fish are old, they are slow growing, and the big ones are individually known to the fishery. Wet everything, keep them in the water, and let the staff do the lifting. They have done it ten thousand times and you have not.
If one comes to the net, take the photograph quickly and put it back properly. That fish will be caught again by somebody else next month and everyone would like it to still be there.