Pros
Since moving buildings and the takeover of BP the company seems to be making slow but needed changes. The working atmosphere in general seems better. The people in all departments generally work well with each other, though with a company this size it is not going to be a bed of roses all the time with 300+ employees. The IT department was very overstretched, but this is probably now in hand. From a personal point of view I enjoyed working with the majority of the people I met in the company.
Cons
The MD and management need to understand more what is going on in the company in general and not fear to delegate accordingly, but this should changes with the BP takeover. These are only my observations and things may have changed somewhat since I left. My standard hours were 8.30am to 5.30pm which leave you exhausted by the end of the week if you have a long commute.