I did write this post with a lean toward coming from the US which is a "LISTED" country and does not require the extra blood test.
The blood test for rabies is only needed if you are traveling from an "UNLISTED" country, so a country that is
NOT in the EU or
NOT one of the countries below. So if you are traveling from a country
NOT below you need the blood test.
Andorra, Azores and Madeira, Canary Islands,French Guiana,Gibraltar,Greenland and the Faroe Islands,Guadeloupe, Iceland, Liechtenstein, Martinique, Monaco, Norway, Reunion, San Marino, Switzerland, Vatican City
Antigua and Barbuda, Argentina, Aruba, Ascension Island, Australia, Bahrain, Barbados, Belarus, Bermuda, BES Islands (Bonair, Saint Eustatius and Saba), Bosnia-Herzegovina, British Virgin Islands, Canada, Cayman Islands, Chile, Curaçao, Falkland Islands, Fiji, French Polynesia, Hong Kong, Japan, Malaysia, Mauritius, Mexico, Montserrat, New Caledonia, New Zealand, Russian Federation, Saint Maarten, Singapore, St Helena, St Kitts and Nevis, St Lucia, St Pierre and Miquelon, St Vincent and The Grenadines, Taiwan, The former Yugoslav Republic of Macedonia, Trinidad and Tobago, United Arab Emirates, USA (includes American Samoa, Guam, Northern Mariana Islands, Puerto Rico and the US virgin Islands), Vanuatu, Wallis and Futuna.
https://www.gov.uk/take-pet-abroad