Double arm 12 inch frame , Hamilton green medium pile roller sleeves, any scuttles just make sure they take a double arm roller but for me personally go to a dulux trade centre as their gear is no more expensive than the rest and nicer to use.
https://www.screwfix.com/p/ronseal-high-performance-wood-filler-natural-550g/51811 Two pack wood filler would be fine for the job, don't sand it just fill flush or wood glue and sawdust.
Ever heard of a hospital job it could be yours, Through various trades I heard this spoken often as the tradesman would take the job on and use it in emergency s only i.e: if they were let down on their current job with materials being late or other tradesman not finished so they couldn't do their work or a rain stops play work day then it would be lets go to that job and keep him happy for a day .
On a serious note I feel for you and its not good practise when they don't even contact you.
For stairs and I have been in a domestic and commercial setting for over 25 years you can't beat a telescopic ladder for stairs . Before they were invented I looked pretty silly taking one half of a full size double ladder through the house to use .
Nightmare when somebody paints upvc there is ways and means to overcome this but the cost of products ,you have made the right and quickest approach - just replace it.