As stated above, HSBC (as an organisation) doesn't seem to have any specific policy regarding pilot training (fixed wing or rotary) - whether they'll give you any money or not depends on the specific branch you go into. I know my local HSBC will loan me £25k for helicopter training (in a professional studies loan), or more if I have something to secure the loan on; I also know of several branches that won't do anything special for pilots of any stripe.