Hmmm, here are my estimates for labour (not materials) for some of it, but this is v. v. much an estimate, with a lot of it based on the local builder / handyman I would probably use who does a good quick job at a fair price. I may be off by quite a way.
Prep and paint walls, ceiling and all woodwork of large room 1 - £150
Strip wallpaper from largish room - £75
Repaper and then paint walls, ceiling and all woodwork of large room 2 - £200
Replace cupboard doors - £75
Remove laminate from loft room - £50
Creating stud wall - £300
Add door into wall - ???? no idea, never done this
Carpeting - would be done by carpet people and included in carpet quote
Move kitchen plumbing to new room - Not done this, but £1000 once you've included a plasterer making good, etc?
Move gas to new room - £500 ?? would be made good at the same time as the new plumbing
Knock through two rooms - £2000 ?? depending on what you actually mean by knocking through
Make good plaster, ceilings etc after knocking through two rooms - £500 ?
Redo flooring in two rooms after knocking them through - ? depends on what you want
Redecorate both rooms after knocking them together - £300
Make good after removing the plumbing and gas in the previous kitchen - £500 ?
Redecorate previous kitchen - £150
But as NavyEyeLash says, you need massive contingency funds, esp in an old house, as there's loads you haven't budgeted for.
Typical e.g. - I get plumber in to chase radiator pipes into walls. Plumber discovers stop cock is gone and replaces it. Plumber does job, with various probs coming up along way (including 'this part of the timber frame seems to have rotted')). Pipes went into boxing in in loo. Boxing in now needs replacing. Plumber discovers central heating system is sludged up. Etc etc.