Weather forecasters have issued a yellow health alert as temperatures could climb to heatwave levels. Kent is set to bask in the sun at last across the next few days after weeks of rain, wind and overcast skies. The likes of Ashford, Canterbury, Gravesend and Maidstone look set to hit between 23C and 26C between Monday and Thursday. But the high temperatures could put increased pressure on healthcare services after a yellow heat health alert was issued. It comes into force from 8am on Monday and remains in place until 5pm on Thursday. The alert was issued jointly by the UK Health Security Agen…