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Howard
Hmm this is well outside my comfort zone for advice, but I would suggest giving building control a call to find out if you replace it with a similar design whether it would need to go for approval. If you want something similar it's unlikely you'll find a product to match so yes then you are back to drawing up a design and asking an engineer to give you some comfort that the load-resistance is ok. The balusters and handrail resisting lateral forces is less of a worry than over-turning which depends on what the main uprights are fixed into and how. However, an engineer will not (usually) give advice on things like detailing to prevent water sitting on/under the bottom rail or waterproofing the connection to the building - a practical architect, builder or joiner may be a better bet for that.