All the ones in Britain start with EG.
This site may help.
http://www8.landings.com/cgi-bin/get_file?APT/icao_prefix.html ICAO Airport Code Prefixes
Country Valid ICAO Code Prefixes
AFGHANISTAN OA
AL JAZA'IR (ALGERIA) DA
ALBANIA LA
AMERICAN SAMOA NS
ANGOLA FN
ANGUILLA TQ
ANTARCTICA NZ,SA,SC
ANTIGUA AND BARBUDA TA
ARGENTINA SA
ARMENIA UD
AUSTRALIA Y
AUSTRIA LO
AZERBAIJAN UB
BAHAMAS MY
BAHRAIN OB
BANGLADESH VG
BARBADOS TB
BELARUS UM
BELGIQUE/BELGIË (BELGIUM) EB
BELGIUM EB
BELIZE MZ
BENIN DB
BERMUDA TX
BHUTAN VQ
BOLIVIA SL
BOSNIA-HERZEGOVINA LQ
BOTSWANA FB
BRAZIL SB,SD,SN,SS,SW
BRITISH INDIAN OCEAN TERRITORY FJ
BRITISH VIRGIN ISLANDS TU
BRUNEI DARUSSALAM WB
BULGARIA LB
BURKINA FASO DF
BURUNDI HB
CAMEROON FK
CANADA C
CAPE VERDE GV
CAYMAN ISLANDS MW
CENTRAL AFRICAN REPUBLIC FE
CHILE SC,NE
CHINA RC,VH,ZB,ZG,ZH,ZJ,ZL,ZP,ZS,ZT,ZU,ZW,ZY,VM
COLOMBIA SK
COMOROS FMC
CONGO, DEMOCRATIC PEOPLES'S REPUBLIC FZ
CONGO, REPUBLIC OF THE FC
COOK ISLANDS NC
COSTA RICA MR
CÔTE D'IVOIRE (IVORY COAST) DI
CROATIA LD
CUBA MU
CYPRUS LC
CZECH REPUBLIC LK
DANMARK (DENMARK) EK,BG
DEUTSCHLAND (GERMANY) ED,ET
DJIBOUTI HD
DOMINICA TD
DOMINICAN REPUBLIC MD
ECUADOR SE
EGYPT HE
ÉIRE (IRELAND) EI
EL SALVADOR MS
EQUATORIAL GUINEA FG
ERITREA HH
ESPAÑA (SPAIN) LE,GC,GE
ESTONIA EE
ETHIOPIA HA
FALKLAND ISLANDS (ISLAS MALVINAS) SF
FIJI NF
FRANCE LF
GABON FO
GAZA STRIP LV
GEORGIA UG
GHANA DG
GREECE LG
GRENADA TG
GUADELOUPE TF
GUAM PG
GUATEMALA MG
GUINEA GU
GUINEA BISSAU GG
GUYANA SY
GUYANE FRANÇAISE (FRENCH GUIANA) SO
HAÏTI MT,CT
HONDURAS MH
INDIA VA,VE,VI,VO
INDONESIA WA,WI,WR
IRAN OI
IRAQ OR
ISRAEL LL
ITALIA (ITALY) LI
IVORY COAST DI
JAMAICA MK
JAPAN RJ,RO
JORDAN OJ
KÂMPUCHÉA (CAMBODIA) VD
KAZAKHSTAN UA
KENYA HK
KIRIBATI NG
KOSOVO LY
KUWAIT OK
KYRGYZSTAN UA
LA POLYNÉSIE FRANÇAISE (FRENCH POLYNESIA) NT
LAO PEOPLE'S DEMOCRATIC REPUBLIC (LAOS) VL
LATVIA EV
LEBANON OL
LESOTHO FX
LIBERIA GL
LIBYAN ARAB JAMAHIRIYA (LIBYA) HL
LITHUANIA EY
LUXEMBOURG EL
LÝÐVELDIÐ ÍSLAND (ICELAND) BI
MACAU VM
MACEDONIA LW
MAGYARORSZÁG (HUNGARY) LH
MALAWI FW
MALAYSIA WB,WM
MALDIVES VR
MALI GA
MALTA LM
MARIANA ISLANDS PG
MARSHALL ISLANDS EN,PK
MARTINIQUE TF
MAURITANIA GQ
MAURITIUS FI
MÉXICO MM
MICRONESIA PT
MOLDOVA LU
MONACO LN
MONGOLIA ZM
MONTSERRAT TR
MOROCCO GM
MOZAMBIQUE FQ
MYANMAR VB,VY
NAMIBIA FY
NAURU AN
NEDERLAND (THE NETHERLANDS) EH
NEDERLANDSE ANTILLEN (NETHERLANDS ANTILLES) TN
NEPAL VN
NEW CALEDONIA NW
NEW ZEALAND NZ,PL
NICARAGUA MN
NIGER DR
NIGERIA DN
NIUE NI
NORGE (NORWAY) EN
NORTH KOREA ZK
OMAN OO
ÖSTERREICH (AUSTRIA) LO
PAKISTAN OP
PALAU PT
PANAMÁ MP
PAPUA NEW GUINEA AY
PARAGUAY SG
PERÚ SP
PHILIPPINES RP
POLSKA (POLAND) EP
PORTUGAL LP
PUERTO RICO TJ
QATAR OT
REPOBLIKAN'I MADAGASIKARA (MADAGASCAR) FMM,FMN,FMS
REPUBLIKA SLOVENIJA LJ
REUNION FME
ROMANIA LR
RUSSIA UA,UE,UH,UI,UL,UN,UO,UR,US,UU,UW
RWANDA HR
SAINT HELENA FH
SAINT KITTS AND NEVIS TK
SAINT LUCIA TL
SAINT PIÈRRE ET MIQUELON LF
SAINT VINCENT AND THE GRENADINES TV
SAMOA NS
SÃO TOMÉ E PRÍNCIPE (SAO TOME AND PRINCIPE) FP
SAUDI ARABIA OE
SENEGAL GO
SERBIA AND MONTENEGRO LY
SEYCHELLES FS
SIERRA LEONE GF
SINGAPORE WS
SLOVENSKEJ REPUBLIKY (SLOVAKIA) LZ
SOLOMON ISLANDS AG
SOMALIA HC
SOUTH AFRICA FA
SOUTH GEORGIA AND THE SOUTH SANDWICH ISLANDS EG
SOUTH KOREA RK
SRI LANKA VC
SUDAN HS
SUISSE/SCHWEIZ/SVIZZERA/SVIZZRA (SWITZERLAND) LS
SUOMI (FINLAND) EF
SURINAME SM
SVERIGE (SWEDEN) ES
SWAZILAND FD
SYRIA OS
TAIWAN RC
TAJIKISTAN UT
TANZANIA HT
TCHAD (CHAD) FT
THAILAND VT
THE GAMBIA GB
TIMOR LOROSA'E (EAST TIMOR) WP
TOGO DX
TONGA NFT
TRINIDAD AND TOBAGO TT
TUNISIA DT
TURKEY LT
TURKMENISTAN UT
TURKS AND CAICOS MB
TUVALU NGF
UGANDA HU
UKRAINE UK
UNITED ARAB EMIRATES OM
UNITED KINGDOM EG,LX
URUGUAY SU
US VIRGIN ISLANDS MI,TI
USA K,X,PA,PB,PF,PJ,PL,PM,PO,PP,PH,PW
UZBEKHISTAN UT
VANUATU NV
VENEZUELA SV
VIÊT NAM VV
WALLIS AND FUTUNA ISLANDS NL
WEST BANK OJ
WESTERN SAHARA GS
YEMEN OY
ZAMBIA FL
ZIMBABWE FV
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