I appreciate the responses.
It appears the commuting aspect of what I'm considering may be the deal breaker.
I had thought it would be 3 or 4 trips, 5 on a bad month. Now Im hearing of a sixth.
I also (it appears somewhat naively) thought the cost of staff travel commuting would be of a more negligible nature. Sadly there's nothing negligible about £100 return 5 or 6 times a month.
Oh well, better to find out now I suppose.
Thanks again for taking the time to reply.