If you're planning to bring British Pounds and Euros with you, I would plan on £400 and €200 per couple as an estimate, and that allows you to pay cash for some meals as well. Otherwise, ATM cash withdrawals will be the best method for getting cash in each destination. If you don't have a no transaction fee debit card, others in the group will be able to assist with this to avoid additional bank fees.
Specifically for the Globus Tour:
Tour Director: £60.00 per person
Driver: £35.00 per person
Hotels for housekeeping: £2–5 per night
Tipping in both Scotland and Paris is much more relaxed than in the U.S. You are not expected to tip everyone for every interaction, and there is no need to calculate 20% at every meal. Think of tipping as a thank-you for genuinely good service rather than an obligation.
Housekeeping tips are appreciated but not mandatory in either destination.
For a private or small-group tour, tipping your guide is customary when you've received good service and had a great experience.
For a particularly outstanding guide—especially someone who is knowledgeable, engaging, or goes out of their way to personalize the experience—tipping toward the higher end is appropriate.
For our walking tour in Paris, please plan to tip at least €20 per person.
If you're ever unsure, rounding up is almost always better than overthinking it. Scotland has a tipping culture that's somewhat closer to the U.S., while France is much more relaxed about tipping.
One important exception: Always check the restaurant bill before tipping. In France, a service charge is generally already included, and in Scotland a discretionary service charge may have been added. If it's already there, you do not need to add another substantial tip.