Galaxy Loss of power problems

Hi everyone,
It's nice to be here, I've just joined the forum although I've looked at it many times previously. It seems to me there are some cracking articles on this site, more in depth than on other sites. Firstly I would like to apologise for having a different badge on my car, but it is a VW underneath, and I have owned a Passat TDI previously.
I own a Ford Galaxy 1.9TDI 110BHP 2001 manual gearbox model and at present am having problems with a loss of power. The engine starts fine, it revs fine when your not in gear, the problem comes when I try to accelerate - there is just no power and it feels as if it is holding back. If I don't put my foot down I can progress but any incline or acceleration and there's no response. On the passat I used to have I had a similar holding back although that was intermittent and it turned out to be the MAF sensor, so the first thing I have done is replaced the MAF sensor on my Galaxy but it hasn't cured my problem.
Incidentally the cheapest place I found on the web to get my MAF sensor, and it is a genuine Bosch was www.autotekelectronics.com It was only £51.75 including VAT and delivery and arrived the next day by courier. I seem to be running out of space so I'll continue in the next box. I'm new to this.