Help please...Home insurance massively higher than neighbours! (in flat roof and flood risk area)

Hi, has anyone experience of this or know any reason why this may be the case?
I have an end of terrace house built in 2020. I am one of 6 identical houses - they are built in 2 blocks of 3 (so 2 mid terrace and 4 end terrace) I'm an end terrace. They are 3 storey townhouses with flat roofs. We are also in a flood risk area. So this has proved tricky with getting insurance. 
My neighbour recommended Direct Line to me this year as my previous insurer won't insure for flood. He is on his own and a mid terrace cost around £265 pa. The next house along (a family), so an end of terrace also went through DL and it cost around £300. They are both new insurers with DL requesting same as me (buildings/contents) same £250 excess.
I have been quoted around £770!!!!
I have phoned for a quote twice and discussed this with them (they couldn't tell me the reason for this. Though said maybe check my credit score. I did and it is 999 out of 999) I have also done several online quotes.. I changed the start dates a bit... this altered the cost slightly but not by much. I also changed the address to another of the end of terrace houses in my row... this gave me a quote of £160!!! So it is obviously connected to my address and not to me.
Before our houses were built there was a car service garage on the plot and the address was the same as my address. Could this be connected in some way?
Does anyone have any insight on this or know how I can find out? 
Direct Line said there is no way they can find this out and wouldn't let me speak to their underwriters.
I would very much appreciate anyones help or advice in this. Thank you

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