Suspension bushes are components that will eventually wear out, but their lifespan can be affected by particularly harsh roads or environmental factors, so how the cars has been used may have some bearing on this. An advisory is not a failure so it may be that the bush will pass future MoTs, but we would suggest having it inspected and replaced. It may not be covered under your warranty as it is potentially a consumable part, but you may wish to contact your dealer in the first instance to confirm.