Get yourself to
screwfix, get some
Enlite 5w lamps, bin the megamans and you'll be fine. I fitted 4 of these in my parents bathroom in some generic fire rated downlights covered with insulation
about 3 years ago and they're still going strong.
We fit those lamps on a daily basis (or the integrated equivalent) and I don't remember ever having to change one because it's failed. BG and Luceco we've had multiple DOA/first 100 hour failures. 210lm for a 4w is disgraceful.
The Enlite is ~500lm for 5w. You might not want to go that bright - and they do do a 4w but never used it so can't say how good it is, but even that's 420lm.
I think the fact they've got DOUBLE the lm/w ratio says something about the quality.