The problem stems primarily from having a ton of linetypes.  Did you happen to look at how many were loaded?  I assumed most weren't even being used and I was right.

The secondary problem with your drawing is no one has bothered to clean it up.  It has duplicate objects, overlapping lines, dozens of unreferenced reg-apps, as well as other useless entities that are no longer germaine to the drawing. 

All of this points to poor CAD practices by someone (not necessarily you as I don't know the true history of the drawing) but none-the-less when you receive a drawing or use parts of a drawing from someone else the FIRST thing you should do is clean it up with the Overkill, -Purge, Audit commands then follow that up by WBlocking everything out to a new drawing.

I've gotten your file size down to under 2MB.

A cheeky request, but I don't suppose you fancy sending over the cleaned up version do you?

You don't ask, you don't get etc 

Cheers John.

Cleaning as I type

full 2014.

I always purge (it's almost an OCD). But never really overkill or audit tbh. But I recon I'll be doing a bit more in terms of cleaning, from now on.

I'll admit, I've been quite lazy with this particular drawing. It was passed on to me and I've never really given it much time or efforst, as I only need to change a few text boxes / amend small detail from time to time.

Not sure if I'm being basic, but even after performing the above cleaning operations, the drawing size is still huge!

I really need to get this back down to the 3/4mb It used to be, as we are uploading onto portals etc.

Any advice? (John) lol