Misfire/stutter when driving?

[minisandfords]

My 1.4 petrol multi space has a weird habit at the minute- sometimes when driving it will just stutter or misfire and then go back to normal! The other day it cut out completely but restarted and continued rest of journey fine!

I have replaced fuel filter and spark plugs and it's still doing it. Having searched forum I reckon it's either the fuel pump relay or pump itself according to other similar posts.

Would rather try relay first as it's cheaper, so does anyone know if this part or the right one?

https://www.ebay.co.uk/itm/302105998605

Thanks in advance as usual!