A couple of scenarios

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Hopefully the last post from me for a while! Thank you to all of you who have given me advice so far.

I've decided not to proceed with the current property and have informed the estate agent about this.

Current plan is as follows.

Overdraft was completely cleared on the 15th April. This was partially from the deposit money, and partially from my own savings.
Credit cards were completely cleared yesterday with money from the deposit. One will be cancelled as soon as the money clears, the other will remain open but with a reduced credit limit, and I plan to spend a little on it each month and then completely clear it each month.

I will be remaining in my current rented place until the end of June, which gives me two months there. My calculations give me an estimated savings amount in this period of approx £800.

I will (hopefully) be getting back the rental deposit of £1000 when I leave at the end of June, which will go into savings.

I will be moving into my parents' spare room for a month or two. While I'm there, I should be able to set aside approx £1400 per month in savings.

Altogether this should mean I have around £4600 of my own savings to add to the £17,500 which is the remains of the gifted deposit from my parents. I intend to use £20,000 as a deposit, and the rest as money for solicitors fees etc.

In terms of bank account conduct, which was the biggest problem this time around, I'm planning to do the following:

I get paid at the end of the month. All my bills come out either via direct debit or manually in the first couple of days after I'm paid.
I then plan to take a set amount of money out at the beginning of each week to cover expenses, and not use my debit card at all.
At the end of the month, anything left in the current account will be transferred into savings.

My credit reports are showing no issues at all - all green, so it seems that the bank account conduct was the biggest issue.

The intention is to do this for three months, and then look again at whether a mortgage is feasible sometime around August/September. Does this sound like it should work?

One last question - I'll be moving in with my parents for that last couple of months. I obviously need to change all my addresses on everything for that short period, and I assume I will need to change myself on the electoral roll for that tiny period as well. How much will that impact the chances of getting a mortgage, if at all?

Again, thank you to all of you who have offered advice.