Have you any idea what any of this will cost? The level of work involved?
Have you ever done any refurbishment work?
As a landlord, I would want to know that you are not replacing old quality with cheap modern tat from b&q, and that the quality of workmanship would be good.
I would not be keen to let you rip the bathroom suite out, unless I saw a quote from a builder/plumber and got a say in the units and the tiles. Once you remove these items, you may easily discover problems that will be costly to sort out, or something may happen during removal. Just the bathroom would likely cost 5-10 k, not including tiling and ripping out old tiles.
replace internal doors? Do you know roughly how much this will cost?
What are the current doors? If you were considering replacing original wood doors with cheapo white hollow doors for £29 a pop from B&Q I would not be happy.
Tiling the floor? Do you know anything about underlay required for tiling floors?
I would be quite happy to let you pain skirting and doors (white), and paper and paint walls (neutral), along with new carpets, if they were high quality carpets and underlay. This would cost a couple of thousands, as there is no way I would let you put in carpets that will HAVE to be replaced once you move out, as opposed to professionally cleaned.
My issues with your list of work that needs doing is that I cant possibly imagine how you can afford all this (we are talking 30k up) and not have funds to get on the property ladder.
There is no point at all broaching this with the landlord if you have no idea what this will cost. If you were to approach me with this, without knowing the cost, I would say "no" outright and think you a bit of a looney