Security. As with our able-bodied counterparts, disabled travellers are wealthy compared to the local population in developing countries. Don't be flashing money in public places; apart from being rude, it's asking to be robbed. Spread it around. Under your cushion, in your socks, in a money belt under your T-shirt. Because of your mobility problems you are more vulnerable, but being alert and vigilant, and acting confident and in control all reduce your chances of theft.

Denominations. I try to predict approximate costs of travel and accommodation so I know how much local currency/hard currency cash and traveller's cheques to carry. Hard currency is normally US dollars, Euros or GB pounds. A good rule of thumb is to have one third of your hard currency cash and two thirds in traveller's cheques. It's often more difficult to exchange travellers cheques than cash, so try to keep the cash as long as you can. I carry only enough local currency for the next few days as it is often bulkier and can be difficult to change in your own country.