I am with AIB Finance and Leasing and I recently applied for the lower tracker. At first they told me I needed to get a valuation done. I did nothing about it at the time as I was getting work done on the house and I wanted to get the valuation done afterwards.
As the rates kept rising I rang again as part of a total review of my mortgage (increasing repayments, once off lump sum payment, going on lower tracker and possible switch to another lender etc.). I told them I reviewing my mortgage situation and wanted info. I told them I was holding off doing the valuation as I was doing some home improvements and the place was a bit of mess at the moment. They said not to worry about the valuation that they would accept a print out from myhome.ie of a similar house in the area as proof of valuation. I printed it down and sent it off and I am now on the lower LTV tracker.
Ask if they will accept it as proof. If their sister company is accepting it then they might too. It can't hurt to ask and it might save you €100+.