Hi ricopaul,
Don´t know about the 2200 haven´t tried that for many years and not over here (that model is over 10 years old and will be slow at changing channels and accessing the epg), the 2500 is only fit for the landfill, probably Paces worst machine. The Pace 2600 was excellent in its day but why buy into such old tech? I found a modified (PSU rebuild) Thomson HD box had just as sensitive tuner as the 2600 and you get the advantage of HD and even for SD you can connect by HDMI giving a better picture over scart on a suitably equiped tv. But most importantly for you you would get Channel 4 HD on your small dish with a matched white card.
And if you want the main channels I would suggest a min of 2.7m offset (I have yet to see a 2.4m that works 24/7 without some breakup, and I have seen alot).