I need audio files turned into Word transcripts

I am conducting some one-to-one 1 hour interviews over the period 6th-11th July.
These will all follow the same general interview framework but I will be doing a lot of questioning and prompting.
I need the audio files transcribed.

I am looking for someone who can do this quickly and accurately and is experienced with UK brand names, general expressions/slang and accents.

Delivery schedule of the audio files would look something like this:
4 x 1 hour interview audio files by late Wednesday 6th July (UK time)
2 x 1 hour interview audio files by late Thursday 7th July (UK time)
2 x 1 hour interview audio files by late Friday 8th July (UK time)
4 x 1 hour interview audio files by late Monday 11th July (UK time)

Clearly cost is important but so are turnaround timings and reliability of delivery. Please advise when you think you could turn these transcripts around by. My budget is an estimate - don't be put off if you think you would charge more or less.

I have examples of good transcripts but am not wedded to format - it's more about accuracy of language.