Keep track of what's going on with this calendar:

Saturday 13 August

• 24-hour walkout by members of the Aslef union, affecting Arriva Rail London, Avanti West Coast, Crosscountry, Greater Anglia (including Stansted Express), Great Western, Hull Trains, LNER, London Overground, Southeastern and West Midlands Trains
• Unite members employed by DHL in Scotland and Northern Ireland will strike, hitting supplies to Sainsbury's stores

Sunday 14 August

• Unite members employed by DHL in Scotland and Northern Ireland will strike, hitting supplies to Sainsbury's stores

Monday 15 August

• Unite members employed by DHL in Scotland and Northern Ireland will strike, hitting supplies to Sainsbury's stores
• Industrial action by barristers

Tuesday 16 August

• Unite members employed by DHL in Scotland and Northern Ireland will strike, hitting supplies to Sainsbury's stores
•Industrial action by barristers

Wednesday 17 August

• Unite members employed by DHL in Scotland and Northern Ireland will strike, hitting supplies to Sainsbury's stores
• Industrial action by barristers

Thursday 18 August

• Strike action by Rail, Maritime and Transport (RMT) union, the Transport Salaried Staffs Association (TSSA) and Unite
• Unite members in waste, recycling, and street cleaning in Edinburgh
• Industrial action by barristers
• Unite members employed by DHL in Scotland and Northern Ireland will strike, hitting supplies to Sainsbury's stores

Friday 19 August

• RMT walkout on London Underground
• More than 1,600 London bus drivers who are members of Unite and employed by London United will also strike
• Unite members in waste, recycling, and street cleaning in Edinburgh. Industrial action by barristers
• Unite members employed by DHL in Scotland and Northern Ireland will strike, hitting supplies to Sainsbury's stores

Saturday 20 August

• Strike action by Rail, Maritime and Transport (RMT) union, the Transport Salaried Staffs Association (TSSA) and Unite
• More than 1,600 London bus drivers who are members of Unite and employed by London United will also strike
• Unite members in waste, recycling, and street cleaning in Edinburgh
• Unite members employed by DHL in Scotland and Northern Ireland will strike, hitting supplies to Sainsbury's stores (until 0600)

Sunday 21 August

• Workers start an eight-day strike at Felixstowe container port - the UK's biggest
• Unite members in waste, recycling, and street cleaning in Edinburgh

Monday 22 August

• Felixstowe strike continues
• Unite members in waste, recycling, and street cleaning in Edinburgh

Tuesday 23 August

• Felixstowe strike continues
• Unite members in waste, recycling, and street cleaning in Edinburgh

Wednesday 24 August

• Felixstowe strike continues
• Unite members in waste, recycling, and street cleaning in Edinburgh

Thursday 25 August

• Felixstowe strike continues
• Unite members in waste, recycling, and street cleaning in Edinburgh

Friday 26 August

• Felixstowe strike continues
• Unite members in waste, recycling, and street cleaning in Edinburgh

Saturday 27 August

• Felixstowe strike continues
• Unite members in waste, recycling, and street cleaning in Edinburgh

Sunday 28 August

• Felixstowe strike final day
• Unite members in waste, recycling, and street cleaning in Edinburgh

Monday 29 August

• Unite members in waste, recycling, and street cleaning in Edinburgh

Tuesday 30 August

• Unite members in waste, recycling, and street cleaning in Edinburgh
• Industrial action by barristers

Wednesday 31 August

• Industrial action by barristers

Among those balloting for strikes:

Nurses will start voting on strike action next month. The ballot opens on 15 September and lasts for four weeks.

The Communication Workers' Union says it is preparing a ballot for members across Capita O2 and Tesco Mobile partnerships.

Bus drivers in north London are balloting for industrial action.

More than 1,400 bus drivers employed by Arriva are balloting for strikes until 26 August.

Among the ongoing disputes:

Planned industrial action among council staff at Armagh, Banbridge and Craigavon Borough Council in Northern Ireland has been put on hold for talks. They were due to go on strike from 10 August.

Refuse workers in Surrey are seeking better pay - talks are under way.

A dispute between bus drivers and engineers employed by Stagecoach Merseyside is ongoing.