Half a dozen phone calls later and I have prices ranging from £20 per pair (plus hoses) to £70!
The cheaper quote came from a very long established LBS with 5 star reviews. It also happens to be just a pleasant 20 minute ride away. So I will take a risk and book in for next week (the earliest they can fit me in).
I'm off now to work out how to safely fit the handlebars to my bike to take them with me when I cycle there ( there's no cross bar to attach them to, but I'm sure we can work out a safe way to transport them
)
So fingers crossed....
I will report back next week