Hello Abi Whitehouse and welcome to Flyertalk.
The 228 on 24th May is showing almost completely full from (and including) WTP forwards through CW and F. In the seat map for WTP all non-blocked seats are showing occupied but the entire front row is showing as blocked so all is not lost. My guess is that these will be unblocked nearer to departure.
If you want to put your mind at rest I'd suggest you call the airline and see what they have to say about it.
Please do report back on this thread and let us know what actually happens.