Asking for salary expectations before offering me a job interview

[MyNameIsInUse]

Hi guys, I received an email from a company I applied a job for. They're saying my CV matched what they're looking for, however, before organising an interview they need me to confirm what my salary expectations are so they can make sure they can offer me what I want before taking my time.

It's a marketing role for a big company in London (they have restaurants all around the UK). I checked Glassdoor and looked at what other companies offer but the salaries range from 23-40k!

I don't want to go for a low salary because I have the experience but then I'm afraid if I give too high of a number they won't proceed with my application. What would you do?

My commute will be about 3.5k more and it will take me an hour to get there instead of 10 minutes so I need to factor that in too

It's a shit question because often they ask because they want a bargain. If im ever asked again i might say that my salary expectation is that im valued.

What level of Marketing role is it? There's such a gulf between an executive role and a management role. Do you have professional qualifications in Marketing? Chartered Institute or equivalent? This all makes a big difference!