High rise flats mortgage

Hi,
Looking for some advice on gaining a mortgage for an apartment in a high rise block. I am a first time buyer and looking to put down a 10% deposit but I am coming to understand this may be quite difficult. I have contacted the HSBC and they said that they do not take any less than 20% deposit with high rise buildings. I am wondering if anyone else has had a similar problem or if anyone knows of any banks that specialise in these mortgages.

Any help at all would be great.

Thanks in advance
Jonathan Law