There is likely to be a twenty-four hour strike by The Public and Commercial Services union starting in the evening of Wednesday 29 June until the evening of Thursday 30 June. A number of UK Border Agency staff in the UK will not be working during this time.
During this twenty-four hour period there may be additional delays at border control. Individual ports, airports and international rail terminals will be affected. UKBA says that they have plans in place to reduce the impact of the strikes.
Fortunately, it seems that overseas visa services will not be affected by the strike. Premium service applications for visas from within the UK may be affected by the strike. Other Government immigration services will probably be largely unaffected.