In parts, yes, and the risk is rainwater more than rivers. The strict river and sea flood zones cover almost none of the village. Surface water is a different story, with about one in five postcodes carrying a high indicator of some kind. The place sits on a hill for a reason, and the streams in the valley are the reason. Where you buy inside Winterbourne matters more here than almost anything else on the checklist.
Start with the rivers, because they are the part that reads well. Measured against the Environment Agency flood zones, only about one percent of the area falls in the highest river-and-sea band, and the middle band covers well under one percent on top of that. The River Frome runs through the valley and the Bradley Brook divides the village from the ground to the west, but the built-up core largely keeps its feet dry above them. If your only worry is a river coming over its banks into the house, the odds across most of the village are low.
Surface water is where the number climbs, and it is the one to take seriously. Roughly one in five postcodes carry a high surface-water indicator, something like one in six sit in the medium band, and about four in ten have at least a low-level exposure. That is the flooding that arrives not from a named river but from a downpour landing on a hill and running off faster than the drains can take it, pooling at the bottom of a slope or the low end of a street. It does not respect the tidy river maps, and it is why two houses a hundred metres apart can have completely different answers.
The forward look holds roughly steady rather than lurching. Adding the climate allowance to the river-and-sea zones still leaves well under one percent of the area in the adjusted high band, so the strict fluvial picture is not projected to transform. That is the reassurance. The caution sits with the surface water, because more intense rainfall is exactly the sort of event that ground already prone to run-off feels first, and a map drawn to today's storms is not a promise about tomorrow's.
For insurance, none of this is a wall, but it is a question you will be asked. A property with a high surface-water flag can mean a higher premium, a larger excess on the flood portion, or a request for the searches before cover is confirmed. The house next door with a clean flag may see none of that. Get the address-specific flood report and a quote in writing before you commit, rather than assuming the village-wide answer applies to the individual plot, because here it frequently does not.
Blunt version: this is a below-average flood result driven by surface water, not rivers, and the whole game is the specific street. Buy near the top of the hill and check the drainage on the actual property, and you are fine. Buy at the bottom of a slope on a high-risk postcode and shrug, and the water will keep being honest about that long after the estate agent has stopped answering the phone.