Hi and welcome John
There are a few handbook packs
on eBay around the £20 mark (this is the same handbook as the scanned copy here on the forum mentioned above). There is also a Haynes manual available which covers your year (£15 on Amazon)
2005 Berlingo Multispace 1.6i Desire (Iron Grey)
If everything seems to be going well, you have obviously overlooked something.
I bought an 2003 Multispace 1.9 D with no handbook, and I got one from the main dealer, I think it was £15 inc p&p