Paddy,
From my experience. there are 2 possible reasons a map wouldn't be available within 2-3 days:
a. There is an application currently pending on the folio - eg when the house was built, the first transfer from the developer hasn't been registered yet. This means a map of the plot with the house on it hasn't been drawn yet. It could be "pending" in the Land Registry as due to the boom, there have been long delays in "mapping" in the Land Registry. However, the other solicitor should be able to get a copy of the map that would have been submitted with that transfer - I've done it in the past - and it shouldn't take long - a week at most if you work on it...
b. The Land Registry is currently having all maps digitised. A lot of counties are already completed, but not all. If your house is not done yet - this could also be a reason - and sorry - i don't know the solution.
Is your solicitor just concerned that you check the map to satisfy yourself that boundary is correct? Or is it something more?
J