Question: I've just being doing some homework.  According to this website, you can encounter all sorts of sockets, including the old English type.  I wondered what your experience was.

Answer: My experience is that there is no consistency with the plugs.  Some rooms have the normal uk style plug and others the European style plug. Most rooms offer a range of different plugs or multi plug adapters.  I take a European adapter and have always managed with either the standard UK or European plug. 

Question: What currency is used in Ethiopia? What currency should i bring with in order to change it?

Answer:  The currency in Ethiopia is the Ethiopian Birr. It isn't traded on the International Markets - so is only available in Ethiopia. You can change money at the airport when you arrive or at the hotels where we will be staying. 
It is best not to change more than you will need as you can't do anything with the money anywhere else!

You can change any common currency: Stirling, Euro or Dollars are all well known and widely accepted.