Help 11yr old Grandson make his audition on BGT

Hi i am trying to get my 11 year old grandson to the BGT audition he's qualified for but with my income is going to be impossible to get there as we need to find a place for the night before to be at audition in time on Saturday... he is so excited, i dont want to break his heart by not being able to get up to london if amyone is willing to help i would be truly and forever grateful