I've been looking at Aprils following some previous very strong El Nino events* and what's quite striking is the strong trough anomaly over the UK, which mirrors what we've seen recently, and the setup also looks similar to the charts @Cambrian has posted above for 10 days time with the high over Greenland and into the Altantic:
Rolling this forward to the summer and we get the high to the west of us - which is also something we've seen a bit of this week and in some of the models recently. If you look at the summers individually this masks a range of options and if the trough is closer to the UK it could be wetter, but if something like this was to verify it wouldn't be a bad summer for those of us in the west as long as the high stays close enough to the UK to be enough of an influence. It might not be as hot as some recent years though.
*looking at this 2023-24 has actually been classified as "strong" rather than very strong which these charts are based on, though: https://ggweather.com/enso/oni.htm
El Niño and La Niña Years and Intensities
GGWEATHER.COM