London Underground's proposed new groups on the Victoria line are as follows:

North group - Walthamstow Central, Blackhorse Road, Tottenham Hale, Seven Sisters, Highbury & Islington, Warren Street - 6 stations, c.130 staff

• This is the current Blackhorse Road group with Warren Street added. Currently, Blackhorse Road group has 134 staff; Warren Street has 21 and its share of its current group's reserve is around 8. Total = 163. So, management's proposals represent the loss of around 33 jobs on these stations.

South group - Victoria, Pimlico, Vauxhall, Brixton - 4 station, c.155 staff

• This is the current Brixton group with Victoria added. Currently, Brixton group has 89 staff; Victoria has 70, and its share of its current group's reserve is around 13. Total = 172. So, management's proposals represent the loss of around 17 jobs on these stations.

Victoria line totals - 2 groups, 10 stations, c. 285 staff
Current Victoria line totals - 3 groups, 10 stations, 348 staff
Total job losses on the Victoria line = 63.

Current Blackhorse Road group reserve staff would have to work at Warren Street as well as at the stations that they cover at present. This represents significant extra travelling time for staff, many of whom live in north London.

Current Brixton group reserve staff would have to work at Victoria as well as at the stations that they cover at present. This represents significant extra travelling time for staff, many of whom live in south London.

Current Victoria group reserve staff would probably be redeployed to either the new north or the new south group reserve, and may not get to choose which. So they could end up working as far north as Walthamstow Central or as far south as Brixton, a significant change from their current work at either Victoria or Warren Street stations. They will incur a big increase in travelling time and in the unpredictability and inconvenience of their duties.