zero hour contract and mortgage first time buyer

JOOOBS

Myself and my partner are looking into a mortgage. we're both fairly young and have little outgoings (still at home) We currently have around £25K and are looking at purchasing a property somewhere between 130k and 160k. Currently I work in sales on a 16K basic but also take home around 4-600 a month in bonuses and work regular overtime I'm on a perm contract. my partner works in care on a zero hour contract but in the 2.5 years she has worked there has never taken home less than £250 for the week, usually averages somewhere between 300-350 a week also she is paid fuel allowance. Basically I'm just looking for any information on whether we would be able to get a mortgage and also if anyone could point us in the right direction of someone who might be able to help.
Thanks