Income in Tips

I need some advice on how to apply for a mortgage through a mortgage broker, preferably advice from a broker here. I am a first time buyer looking for a UK residential mortgage. I work abroad and get paid in US dollars. I have no living expenses or debts etc and very good credit. The problem is most of my income is from tips although it is regular and is well documented. The fact that I work away 7 months at a time and my income is mostly tips I think this will make it hard for me to get a mortgage. I need the help of a broker to apply for mortgages in the right way. For example should I show my pay slips that list the tips and salary figure separately or should I show only the income summary I receive before my ‘leave’ (paid holiday) that put both together showing only the totals. Should I tell the whole picture to the broker so that they can best decide how to best apply to the lender?

Thanks for any help you can offer.