I have tried to list the Sussex athlete’s Sussex club as well their contemporary team.
I will concentrate on the senior men then list the Senior women, who did not officially compete until 1973 although there were unofficial races in the early thirties and then follow with the Junior and the Short course races.
Even at the start of the 20th Century big London clubs were eager to sign up top class athletes who had been developed by local clubs and several leading Sussex runners were tempted to move.
In 1903 and 1904: Alfred Shrubb (Horsham Blue Star) though by now a member of South London Harriers was the winner of these inaugural races but they only involved the four home countries and it was not until -
1907, when France joined the competition that they were really regarded as an international event.
It was in that year the Ringmer farmer H.S. (Stan) Pullinger of the Brighton & County Harriers made the team and placed 20th at Scotstoun and was also a member of the winning England team.
1924- Newcastle. W.M. (Joe) Cotterell (Royal Corps of Signals/Crowborough) was 1st. Joe never gained a full Sussex qualification, although he won the County title in 1925, as he only qualified to compete in Sussex events because he was stationed at Crowborough.
1928 - Ayr A.T. (Arthur) Muggeridge (Brighton & County Harriers/South London Harriers) 13th.
1929 - Paris W.M. (Joe) Cotterell (Royal Corps of Signals/Crowborough) 1st I do not know if he was still at Crowborough in 1929.
1937 - Brussells J.P. (Pat) Parker (Brighton and County Harriers/Belgrave) (Northern Ireland) DNF at Brussells.
1938 - Belfast J.P. (Pat) Parker (Brighton and County Harriers/Belgrave) 51st (Northern Ireland).
1953 – Paris W.P (Pat) Ranger (Eastbourne Rovers) 21st.
1954 - Birmingham W.P (Pat) Ranger (E.R/South London Harriers) 3rd.
1955 – San Sebastian Hugh V Foord (Brighton Athletics Club) 2nd.
W.P (Pat) Ranger (E.R/South London Harriers) 6th.
1957 – Belgium Hugh V Foord (Brighton Athletic Club) DNF
1969 – Clydebank Bill Mullett (Brighton & Hove) 54th (Scotland)
1970 – Maryland USA Bill Mullett (Brighton & Hove) 115 (Scotland)
1971 – San Sebastian Peter Standing (Brighton & Hove) 5th
Bill Mullett (Brighton & Hove) 25th (Scotland)
World Championships
1974 – Monza Italy Peter Standing (Brighton & Hove) 94th.
1982 – Rome Peter Standing (Windsor S.E) 124th.
1984 – Rutherford U.S.A Tim Hutchings (Crawley A.C) 2nd
1986 – Lisbon Tim Hutchings (Crawley A.C) 74th.
1987 – Warsaw Tim Hutchings (Crawley A.C) 43rd. 
1988 – Auckland Andrew Bristow (Brighton & Hove) 50th.
1989 – Norway Tim Hutchings (Crawley A.C) 2nd.
1990 – France Andrew Bristow (Brighton & Hove) 70th.
1991 – Antwerp Andrew Bristow (Brighton & Hove) 41st.
1992 – Boston USA Andrew Bristow (Brighton & Hove) 26th.
1993 – Spain Andrew Bristow (Brighton & Hove) 69th.
1994 – Hungary Andrew Bristow (Brighton & Hove) DNF
1997 – Torino Italy Andrew Bristow (Brighton & Hove) 69th.
2005 – France Gavin Thompson (Crawley A.C) 120th.
2006 – Japan Gavin Thompson (Crawley A.C) 70th. (1st UK)
WOMEN (Unofficial)
1931 – Calais Lilian Styles (East Grinstead/Westbury) 2nd.
1932 – Croydon Lilian Styles (East Grinstead/Westbury) 3rd.
1935 – Morecambe Lilian Styles (East Grinstead/Westbury) 2nd.
1938 – Belfast Lilian Stiles (East Grinstead/Westbury) 5th.
World Championships
1973 – Belgium Penny Yule (Brighton & Hove) 14th (Win team)
1976 – Chepstow Alison Blake (Aldershot F & D) 34th.
1978 – Glasgow Penny Yule (Brighton & Hove/Portsmouth) 16th
1979 – Limerick Penny Forse (Yule) (Portsmouth) 15th.
Regina Joyce (Crawley) 27th.
1980 – Paris Penny Forse (Yule) (Portsmouth) 7th 1st UK.
Regina Joyce (Crawley) 30th.
1983 – Gateshead Debbie Peel (Crawley) 70th.
1984 - New York Regina Joyce (Crawley) 21st. (Ireland)
Monica Joyce (Crawley) 26th. (Ireland)
1985 - Lisbon Monica Joyce (Crawley) 12th (Ireland)
1988 – Auckland Sonia Vinall (Brighton & Hove) 48th.
1990 – France Sonia McGeorge (Vinall) 35th 1st UK
1991 – Antwerp Sonia McGeorge (Vinall) 38th.
Junior Men
1969 – Clydebank Peter Standing (Brighton & Hove) 7th
1983 – Gateshead Richard Carter (Brighton & Hove) 10th.
Junior Women
2015 – China Grace Baker (Hastings/Aldershot Farnham & D) 82nd.
Most appearances - Men
Andrew Bristow (7) – Tim Hutchings (4) – Pat Ranger, Peter Standing and Bill Mullett (3)
Women
Penny Forse (Yule) (4) – Sonia McGeorge (3)
Highest placing
Men: Hugh Foord 2nd 1955 – Tim Hutchings 2nd 1984 and 1989 – Pat 3rd Ranger 1954
Women: Penny Forse (Yule) 7th 1980 and 14th. Monica Joyce 12th 1985
Note: Alfred Shrubb 1903 – 1904 only Home countries and Joe Cotterell not really Sus