This is the number of MPs ending their careers with each Parliament (by-elections included):

Thanks to mick745

2005-2010 - 240 (a few of these are likely to be returned in 2015, so this number will change)
2001-2005 - 138
1997-2001 - 113
1992-1997 - 257
1987-1992 - 147
1983-1987 - 137
1979-1983 - 153
1974o-1979 - 141
1974f-1974o - 40
1970-1974f - 137
1966-1970 - 166
1964-1966 - 82
1959-1964 - 176
1955-1959 - 148
1951-1955 - 107
1950-1951 - 67
1945-1950 - 200
1935-1945 - 496

The number of 'first time' MPs beginning their careers with each parliament (by-elections included):

2010-2015 - 245
2005-2010 - 132
2001-2005 - 98
1997-2001 - 256
1992-1997 - 145
1987-1992 - 143
1983-1987 - 166
1979-1983 - 130
1974o-1979 - 62
1974f-1974o - 108
1970-1974f - 162
1966-1970 - 113
1964-1966 - 135
1959-1964 - 153
1955-1959 - 114
1951-1955 - 87
1950-1951 - 139
1945-1950 - 388

List of MPS

docs.google.com/spreadsheets/d/1bkK5snG9zWu-TF2CTSlXga1V5xQGE5CcSs-9ynjr-Ik/edit#gid=699015985

Retreads

docs.google.com/spreadsheets/d/1u-wFm6qCYpkT_VOejafnR75ipDtRSwBoKN4q99WetBs/edit#gid=159856529

MPs leaving at dissolution

docs.google.com/spreadsheets/d/1ZloKKTnr1XMRxD0Qp82kQ1kyUwHHK4ZBv-uaUrqcFK4/edit#gid=1664846591