If you do not have a ticket, you can validate on board with your bank card. Remember you can purchase tickets and travel cards and that there are also ticket machines at different bus stops.
People Also Ask
You can pay on the bus with cash, contactless or a debit or credit card.
Either it is a walking tour or a bus tour, it is appropriate to tip your guide with at least one euro per person, depending on how long the tour was. If it was a bus tour, maybe you'll want to give one euro for the driver and one or two for the guide (it's best to give each their tip, as not always they'll be sharing).
The best way to get local currency (Euros) is to use a debit card, able to access the Visa, Mastercard, Cirrus or Maestro networks, in an ATM (Interac cannot be used). Usually, the bank rate will be given for exchange rather than the local tourist rate.
You might also notice that some small shops accept cards only for purchases above a certain amount, normally 10 euros. Also taxis usually take cards, but some do not or simply do not want to take anything other than cash. For these reasons, it is advisable to always carry a little bit of cash with you.
Is it cheaper to use Oyster or contactless? As both cards use the same Pay As You Go system and are compatible with the TfL Oyster & Contactless app, the costs are comparable. As a tourist in London, it can be worth getting an Oyster Card as part of the London Pass.