Yes it is.
There is a very personal story that caused me to quit my career.
Upon returning to UK I thought I would secure employment very easily. How wrong I was!!
Additionally I wanted a job that I felt was ethical.
I would not accept anything that involved telling "untruths".
Despite what many here might think HMRC and UKBA are (were) very ethical employers. Besides which they do not demand specialist qualifications as they have their own internal examinations.
The pay is crap but the potential rewards (and pensions) are very good (imo)
I have no regrets