Tidying up ropey 100-yr old skirting boards

I'm renovating a room in my Victorian house. The skirting boards are arguably overdue for replacement - but I dread the prospect of ripping them out and replacing them. Does anyone know any tricks for tidying old skirting boards up?
The main tattyness is the top edge, which are uneven in all directions after 104 years of amateur wallpapering, painting, scraping, filling, refixing. I've been along them with decorator's filler but they still look rough...
Cheers,
Frank
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Frank W wrote:

Its not too difficult to replace them and argueably less work. Certainly looks much better. You can get reclaimed ones esp. in London but they are expensive for state they are usually in. A friend could not get exact replacement so he took sample to timber merchant (Champions in Raynes Park)who tooled up and produced exact new copies. It wasn't cheap but it looks classy. Mind you this is a guy who will accept nothing less than perfect
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