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I wouldn't have the slightest hesitation in replacing your decking, regardless of bylaws. The only way there could be any consequences is if the neighbours object, which as that has been there for a while is unlikely. If you're feeling nervous, talk to the neighbours.
ColinTheBald-
That's encouraging. I didn't want to open Pandora's box but I did ask one neighbour about it gently, who didn't sound best pleased - the previous owner apparently didn't mention it before building it, 'it just appeared overnight'. I wonder if us redoing it could be a catalyst for them to complain.
On the side most overlooked by our decking, the neighbour literally never goes into his garden - he has allowed his only access to it to be swamped with metres and metres of brambles. But if he ever sold the house I bet the new owners would immediately want to either get rid of our decking, or do something similar on their side - which would be odd. I guess we'd then need a fence between the two.
lemonade
Picture tells a thousand words