Mostly no, with a stubborn minority of yes. Most of the village sits outside the river and sea flood zones entirely. A small band of postcodes does not. Surface water is the one that catches buyers out, because it pays no attention to where the rivers are. This is not a flood village. It is a village where the honest answer depends on which end of which lane you are standing in.
On the Environment Agency's river and sea mapping, about 3% of the area's postcodes fall in flood zone 3, the highest-probability band, and about 2% in flood zone 2. Those two are separate bands rather than one inside the other: zone 2 is the additional medium-probability fringe sitting beyond zone 3, which is why it can legitimately be the smaller of the two here. Everything else in the village sits outside both.
Surface water is a different question with a different map. It comes from rain arriving faster than drains and ditches can take it away, so it turns up in places the river maps have nothing to say about, on ground that looks perfectly sensible in July. In a village threaded with lanes, ditches and culverts, the drainage network is as relevant as the watercourse, and it is the part no seller has ever volunteered at a viewing.
Looking forward, the Environment Agency's climate-adjusted mapping puts about 11% of postcodes inside the flood zones once allowance is made for a wetter future. That is a planning assumption rather than a prediction of any particular winter, but it is the number a lender's valuer and an insurer's model will both eventually see.
For insurance, the practical move is to price it before you commit rather than after. Get an indicative quote on the specific address, ask the current owner what they pay and what excess they carry for flood specifically, and treat a vague answer as an answer. Premiums here will be ordinary for most of the village and pointed for the handful of addresses in the zones.
Pulling the measures together, the broader postcode indicator counts a property as at risk if it rates on at least one measure, surface water included. On that basis 13% of postcodes rate high, 15% medium and 34% low. Those bands overlap with the flood zone figures rather than sitting alongside them, so they are a wider net over the same village, not a second village.
Counted as homes rather than postcodes, the Environment Agency's rivers and sea mapping covers 192 properties across the eight postcodes that carry any risk at all. Of those, 16 sit at high risk, 11 at medium and 18 at low, with 10 of the high-risk properties residential. Postcodes with no risk do not appear in that set at all, so the total is the exposed slice of the village rather than the whole of it.
Whether anything stands between the water and the house is the part most flood summaries skip. Around 7% of postcodes sit inside a modelled high-probability extent with a defence present in the model, and around 7% inside one with no defence present. The word defended is doing a lot of comforting for what it actually means, which is that the model includes a structure. It says nothing about that structure's condition, its design standard, or how it behaves on the night.
On sea level, the nearest tide gauge is at Devonport, where records from 1962 to 2015 show a measured rise of about 2.35 millimetres a year. That is what was recorded over that period, not a forecast, and for an inland village it matters through the wider catchment rather than at the doorstep.
Nothing here falls inside a mapped historic flood outline. The single logged incident on record dates to November 1982 and came from a blocked culvert rather than a river leaving its channel. A clean record is genuinely worth something, though it is evidence of what has been recorded rather than proof of what has never happened.
Flood risk in Bishops Lydeard sits in the middle of the pack: fine for most of the village, real for a short list of addresses, and entirely dependent on which one you are buying. Put the exact address into the Environment Agency's long-term flood risk tool before you get sentimental about the garden.