Pros
Working from home is possible. Ability to move around the business even abroad if you build internal networks. Easy to stay and count the money if you are strong enough to adopt a certain mindset about getting into work and getting home and the possible repercussions of only working 9-5.
Cons
Traditional long standing company that still does very well from the myth that all BT people are paid a small fortune. Some BT salaries and terms were super competitive until mid 90s. Release package payments are a fraction of what they used to be and it is becoming harder to get paid release. BT is reknowned for badly practised performance management. BT and union comms are often contradictory on how the process is applied and the company is still not meeting it's targets for reducing its global head count. Some of the people I still know at BT remain in small niche teams operating as 'mates' I.e. Vendor security and data analysis and they seem to be left alone but many are in larger platform teams (Adastral Park) often managed remotely from India or the US where the management are hard micro managers.