Yes, it is worth considering ring-fencing the funds, just because they are particular about this point. For those from the US it has been rather easy, but you have a currency that flutuates too much, but if you are comitted to coming to the UK, you might want to consider getting a GBP funded account that you would eventually use as your UK bank account setup, putting the funds into that, knowing that they will be in there at the right amount for a period of time and just wait.
One other important thing to note is that don't ring-fence into the safety of something like a savings bond (or a Certificates of Deposit in the US) or some other sort of mechanism that isn't cash. They are very particular that the funds must be in cash.
Garry has recently mentioned some other sort of financial account, that is in foreign currency but pegs itself at a certain exchange rate. I don't know the details of it, but that might be worth considering as well.
For Tier 1, I don't think having an address is necessary. The assumption is that you will have to move to the UK and settle and look for work, which is in part what the maintenance funds are for, but others may know better then I.