In April this year I contacted a builder to replace my conservatory

In April this year I contacted a builder to replace my conservatory roof - he was doing my neighbour's at the time- he gave me a price for materials for £1,452 .08 and said he would need that 'up front' then £200 /day for labour . He said the job would take 2 days.
The cheque was given to him on 11/04/14 and I remember signing a 'contract ' of some sort.
After much chasing up and patience by me ( single woman, by the way) he has only just completed the work this past week as he had allegedly had health issues and hospital appointments.
I was aggrieved that he had not kept me informed considering the time lapse but was patient as the present roof is not leaking and the weather has been kind.
The materials were delivered in May and the work was planned for the end of May.
I did become agitated with the delay as, asi explained to the builder I could not get in my garage as it was full with the roof materials.
As I could not find the copy of the contract I asked the builder on two occasions to give me another one but he has failed to do so.
The roof he has fitted is about 6" higher than the original and he told me I will need a plasterer to fill in the gaps.
This was not discussed at the start nor was the fact that I will have to pay extra for a plasterer.
I paid a total of £686 to him on Friday which is actually £286 more than I had anticipated.
He told me that was for sealants and foam.
He also quoted my an extra £200 if we put the cheque 'through th books'.
Naturally I went for the cheaper option.
He did not give me receipt and said he would email me one through. I explained I need some kind of receipt as I plan to sell my house in the near future.
I am awaiting quotes for the plastering job but feel that extra plastic trim on the inside of the conservatory fitted by the builder would solve half of the gap problems as it is just extending the internal plaster board and dividing upvc up to the roof.
It was not until yesterday when I opened my garage to look for something that I was faced with a garage full of my old roof materials!
He did not tell me he would not be taking it away, which I expected him to do as part of the job.
I am now in a dilemma and feel I want to stop th cheque until he gets the job finished, clears the rubbish and gives me a receipt or invoice.
Surely if the job did not go through his business books then the receipts for the materials are mine?
He is an imposing character of a man who has been very familiar in his conversations with me but I got the feeling that he is a bit of a bully so I obviously do not want to attract any repercussions though I would not hesitate to call the police if I felt harassed.
On the one hand I could just leave it, clear the rubbish myself and get someone else to finish off the job - favourable, but I also feel he should not be allowed to treat customers this way and want some kind of justice.
Can you suggest what I do?