So many educated speakers say [ɑːst] for asked, that this pronunciation must be regarded as no longer incorrect.

What is the usual pronunciation of next station?

In careful speech the simplifications marked with an asterisk are avoided, as also such pronunciations as [ail dʒʌssij] for I'll just see, [difikl̩ kwestʃn̩z] for difficult questions. The omission of [k] in the pronunciation of arctic and antarctic and of [g] in recognise is generally regarded as faulty.

Unfamiliar groups of consonants at the beginning of words are simplified by dropping the first sound; notice the simplification of

bdin bdellium;
chthin chthonian;
gnin gnaw, gneiss, gnome, gnostic;
gz (x) in Xerxes [zəːksijz], Xenophon;
knin knee, knit, know, etc.;
mnin mnemonic;
phthin phthisis [θaisis], also [taisis];
pnin pneumatic, pneumonia;
psin psalm, pseudo-, Psyche, psychic [saikik], psychology, etc.;
ptin ptarmigan, Ptolemy;
swbecomes s in sword (observe also answer);
wrin wreck, write, etc.

Similarly, an unfamiliar group at the end of a word is simplified, usually by dropping the last sound; notice—

lnin kiln (some do not drop this n);
mbin bomb, catacomb, climb, comb, dumb, hecatomb, lamb, limb, plumber, succumb, tomb;
mnin autumn, column, condemn, contemn, hymn, limn, solemn.

(The opposite tendency is found in vulgar speech, where [vɑːmint] is said for vermin, [draund] for drown.)