Size is Not Important

The way you plan, structure and write a bid should not vary according to the value of it. It doesn’t matter if your proposal is for £5k or £500m.

A systematic approach to producing a high-impact customer focused document will work throughout; it is only the quantity of material which will change.
With bigger bids the process becomes more formal and the number of people involved will increase. With smaller bids the decisions are probably thought through more quickly however the same steps should be taken.