Apparently you need a UK visa if you are from one of the following countries:AfghanistanAlbaniaAlgeriaAngolaArmeniaAzerbaijanBahrainBangladeshBelarusBeninBhutanBoliviaBosnia-HerzegovinaBurkina FasoBurma (Myanmar)BurundiCambodiaCameroonCape VerdeThe Central African RepublicChadChina (PRC)ColombiaComorosThe Democratic Republic of the CongoRepublic of the CongoCubaNorthern CyprusDjiboutiDominican RepublicEcuadorEgyptEquatorial GuineaEritreaEthiopiaFijiGabonThe GambiaGeorgiaGhanaGuineaGuinea BissauGuyanaHaitiIndiaIndonesiaIranIraqIvory CoastJamaicaJordanKazakhstanKenyaKosovoKuwaitKyrgyzstanLaosLebanonLesothoLiberiaLibyaMacedoniaMadagascarMalawiMaliMauritaniaMoldovaMongoliaMontenegroMoroccoMozambiqueNepalNigerNigeriaNorth KoreaOmanPakistanPalestinian AuthorityPeruPhilippinesQatarRussiaRwandaSao Tome & PrincipeSaudi ArabiaSenegalSerbiaSierra LeoneSomaliaSouth AfricaSri LankaSudanSurinamSwazilandSyriaTajikistanTanzaniaThailandTogoTunisiaTurkeyTurkmenistanUgandaUkraineThe United Arab EmiratesUzbekistanVatican CityVenezuelaVietnamYemenZambiaZimbabweGoogling also finds (in case you havea supplementary question):-"During 2020, 589,838 applications submitted, 627,805 decisions made, and 506,644 UK visitor visas granted, 118,292 applications rejected, 2,846 applications withdrawn, and twenty-three applications lapsed. Therefore, the UK visitor visa success and refusal rate in 2020 is 80.7% and 18.84%, respectively."You can sleep safely, Ms Hammond.
David Ainsworth ● 1405d