Here are the drawings for a proposal I did for a friend last year. Normally the planning officers are nice enough to tell you what drawings they are expecting and at what scale. I usually use 1:50 for plans and 1:100 for sections and ele's to keep it a bit vague. However I didn't get consent for this design as I didn't look at the SPD (Supplementary Planning Document), I'm a technical guy and only do working drawings normally! All of the documents are on the local authorities planning page so I didn't have much of an excuse.
If you need a location plan I usually download a CAD plan from Promap which has the copyright number on it depending on the site it costs £30+. Apparently LA's will check to make sure that the copyright for any maps are valid, so its no good photocopying an OS map they probably won't accept it.