Airlines will look to replace lost capacity at former ZB hubs before looking to SEN. LGW and MAN will be the first that airlines look to replace capacity as they are both slot constrained.
EZY are looking to replace capacity at MAN in addition to Jet2 further expanding at both BHX & MAN for S18.
SEN will likely not see major expansion until at least 2019 when Brexit negotiations have been completed and lost capacity from former Monarch hubs is replaced.