[NowThenGoodBad]

Hey, serious question but off topic from the thread:

You used the word "what" where we would normally use the word "that".

I've heard this done during speech numerous times from everyone ranging from fluent native speakers to learning nonnative speakers. Was there a specific reason you did it here?

[geodel]

Sorry. I am non-native speaker so very likely I am wrongly using 'what' in place of 'that'. After you mentioned I am feeling 'that' would be correct usage.

[losvedir]

It's a British dialect thing, but not sure if that's the case with the poster here. See: https://english.stackexchange.com/questions/162619/usage-of-...

[mhh__]

Emphasis on a British dialect. There are many and most (by geographically area) don't use what in that context. Except for emphasis e.g. The way Jeremy Clarkson says "an ..." where he shouldn't.