Two more things to consider:
- It’s a good idea to find out as much as you can about your lab’s finances. In my department, anyone whose lab doesn’t pull in its own grants is stuck teaching for the entire term of their grad student career. Teaching can be a really good experience, actually–I’ve really enjoyed most of my teaching. But it does mean that your degree will require a lot more time from you. Most of the RAs I know are essentially getting paid to do their own research, which means they’re not spending a ton of time each week in front of blackboards and heaps of student exams. RAs tend to get through much more quickly, and they tend to publish more.
It’s a good idea to aim for an RA, rather than a TA. Since, IME, only relatively wealthy labs offer RAs, working in a rich lab is almost always better than working in a poor one. Don’t assume that all the labs within a single department or program are funded equally. Where I am, one lab can be rolling in money while another is having problems paying for its greenhouse space.
- If you’re offered a TA, find out what the experience of being a TA is like for people in that department. I don’t know if TAs have a lot of rights as workers in the UK, or if there’s a contract that specifies stuff like how many hours a week you work, etc. I know that, in the US, schools with unionized TAs tend to have much better working conditions and pay than schools without TA unions.
Some people get really wonderful TA or GA positions, with great bosses, limited working hours, and excellently-run courses they can support wholeheartedly. But some people don’t.
I’m a TA. I’m very passionate about my subject, and I’ve had a great time sharing what I know of my subject with my students. But I have no contract. I certainly have no real protection if I complain about any unfairness in my job, either. Supposedly, we TAs work 20 hours a week in return for our waiver and stipend. Right now, that sounds like a pipe dream. I’ve worked a minimum of 30 hours a week, on average, as a TA during my time here. There have been times when I’ve worked 40 hours a week on grading alone, when that was only one of my responsibilities as a TA. It’s very easy to end up working more or less full-time for peanuts. And, of course, even if you’re putting in tons of hours in teaching, your advisor, committee, and dept. chair will demand to see progress that’s not much less than that of people on RAs.
I’m not saying all this stuff because I feel like ranting about being a grad student. There are parts of it that I love and would never want to give up. I’m learning a lot, and I’ll be able to make that experience count for me in getting a job that I love later on. And I know that some people have truly wonderful experiences as grad students. I don’t want to discourage anyone from looking into grad studies, but I think that anyone who does so has to look long and hard to make sure that they’re entering a program that’s really going to work well for them.