I purchased a Focus 1.8 TDCi 2005 from salvage, it didn't come with keys and the battery was also flat.

I have had a key cut but not programmed and have removed the battery and charged it indoor (removing the battery was a task!!!)

Now the battery is charged I have put it back in but as soon as I connect it the alarm sounds (I think its the alarm, horn type sound)

Any guidance or advise would be appreciated