Back in 1997 we did a Cosmos tour or England, Scotland, Wales, Ireland and Eire. It was 30 days. There was a recommended tipping of £1 p/d for the driver and £2 p/d for tour guide. For forty people on the tour, if I have calculated correctly, would have been £1200 and £2400 each respectively. For us it was an extra £180 at a time when our $ was only about 52p, not a lot different to todays rate. It may not sound a lot today but in 1997 it was. For a place (UK) where wages were good and with no tipping culture we were very surprised. I can't remember how much we paid but it was not the full recommendation.