Change to ESA Claim

I called DWP today to get an update on my claim for mortgage assistance and was informed they were waiting on my new form as there has been a change of circumstance. Turns out that now I will move from contribution based ESA to income based I have to complete another form. Good job I phoned as no-one had informed me of this. Haven't done this before will it mean a new claim, do I have to complete all the medical information again and wait until this is assessed, followed by another medical? I was put in the work related group after a medical in October, I asked then for copies of the medical as I intended to appeal, I received these two weeks ago but the part detailing the points was missing! I called DWP and was told this part was sent out separately and should arrive soon!! So much for the 1 month limit for appealing I have waited 4 months and still don't have the information I need!!

Mod edit: moved to questions forum

Did they say why you are being moved from contribution to income based ESA?

No Derek, I have been claiming ESA since August 2010 I thought it was because six month was the limit for contribution based ESA.What reasons are there for moving for contribution to income based?

I called DWP, the change is because I have applied for the interest payments for my mortgage, this cannot be paid with contribution based ESA only income based. The agent I spoke to advised there will be no change to my benefits. What financial implications are there?