I think there is very little chance of a house price crash, the worst may be a slight dip or a period of very low growth and some regional variation but as above its supply vs demand. Looking at the official statistics from the ONS its seems very unlikely that supply will keep up with demand so possible the prices could rise further even. They say:
"In mid-2017, the population of the UK was an estimated 66 million – its largest ever."
"The UK population is projected to continue growing, reaching almost 73 million by 2041."
"Sustained UK growth results from births outnumbering deaths (by 148,000 in 2017) and immigration exceeding emigration (by 282,000 in 2017)."
And even if we do leave the EU, "net migration of non-EU nationals in the year to June 2018 was 248,000 - the highest total in 14 years." So roughly they need to build the housing stock equivalent to the city of Bristol every year.