Wales, 1966 vs 1970: seat-by-seat change
Every constituency in Wales compared between the 1966 and 1970 general elections: which seats changed hands and how far each swung.
| Constituency | 1966 | 1970 | Majority | Con–Lab swing |
|---|---|---|---|---|
| Aberavon | Lab | Lab | 44.7% | −4.9 |
| Aberdare | Lab | Lab | 29.9% | −4.1 |
| Abertillery | Lab | Lab | 69.0% | −3.6 |
| Anglesey | Lab | Lab | 14.7% | −2.5 |
| Barry | Con | Con | 14.6% | −6.0 |
| Bedwellty | Lab | Lab | 59.2% | −6.7 |
| Brecon and Radnor | Lab | Lab | 11.2% | −4.9 |
| Caernarvon | Lab | Lab | 6.8% | −6.9 |
| Caerphilly | Lab | Lab | 33.3% | −3.8 |
| Cardiff North | Lab | Con gain | 3.8% | −2.6 |
| Cardiff South East | Lab | Lab | 10.8% | −5.1 |
| Cardiff West | Lab | Lab | 13.3% | −4.4 |
| Cardigan | Lab | Lab | 3.8% | −0.8 |
| Carmarthen | Lab | Lab | 7.9% | −3.3 |
| Conway | Lab | Con gain | 2.3% | −1.9 |
| Denbigh | Con | Con | 18.3% | −2.2 |
| East Flintshire | Lab | Lab | 7.8% | −5.0 |
| Ebbw Vale | Lab | Lab | 57.9% | −2.5 |
| Gower | Lab | Lab | 40.8% | −6.8 |
| Llanelli | Lab | Lab | 46.0% | −2.5 |
| Merioneth | Lab | Lab | 15.4% | −4.4 |
| Merthyr Tydfil | Lab | Oth gain | 23.2% | −20.8 |
| Monmouth | Lab | Con gain | 2.2% | −3.8 |
| Montgomery | Lib | Lib | 8.7% | −3.0 |
| Neath | Lab | Lab | 54.4% | −4.6 |
| Newport | Lab | Lab | 15.0% | −2.3 |
| Ogmore | Lab | Lab | 46.3% | −5.2 |
| Pembroke | Lab | Con gain | 2.2% | −7.1 |
| Pontypool | Lab | Lab | 47.8% | −4.4 |
| Pontypridd | Lab | Lab | 41.6% | −4.1 |
| Rhondda East | Lab | Lab | 44.4% | −3.4 |
| Rhondda West | Lab | Lab | 60.7% | 0 |
| Swansea East | Lab | Lab | 48.6% | −5.6 |
| Swansea West | Lab | Lab | 6.6% | −3.1 |
| West Flintshire | Con | Con | 16.3% | −4.5 |
| Wrexham | Lab | Lab | 28.2% | −2.9 |
Official results House of Commons Library and UK Parliament election results data. Contains Parliamentary information licensed under the Open Parliament Licence v3.0. How we use this data