**UPDATE--7 Dec 4:30 PM GMT
--see Border Force below
The BBC has put together a chart of who is on strike on the days leading up to Christmas:
After Christmas:
Rail Workers:
24 Dec--27 Dec
3-4 January
6-7 January
Border Force--the people who take care of immigration:
23 Dec - New Year's Eve
Border Force has voted to strike from 23 Dec to New Year's Eve. All major airports included. . The government said they will bring in the military, in uniform, to replace them. So, if you are arriving in the UK during that time, your passport may be checked by a soldier. They are getting five days of training. Regular Border Force officers get three weeks of training for checking passports.
Royal Mail
They have been striking and mail delivery is severly disrupted. If you plan to mail something to the UK, do it sooner than later if you want it delivered by Christmas.
I've been affected by the Royal Mail strike. Two parcels mailed last Wednesday from the same company in England to me in Scotland with their 24 hour service aren't even close to delivery. They are sitting in separate sorting centers.
Ambulance Workers:
Ambulance Workers in England and Wales are planning to strike on 21 Dec and 28 Dec.