I remember it well. Long, hot, glorious summer, not to be compared with the last few days in southern/eastern England at all. (I'm advised by fellow Glaswegians that summer 1976 was a bit mince up here and they get tired of being told how dry and hot it was when it wasn't!)
I finished at university by completing my PGCE, helped my parents move from Hertfordshire to Berkshire, got married, spent a delightful honeymoon in the Cotswolds and moved to Hull where we were both due to start work in September.
The thing about 1976 wasn't that it was hot; it was but not record-breakingly so as the daytime temperature stayed in the low 30s throughout. Fahrenheit was more commonly used then and the headlines were about temperatures breaking 90F, which is just over 32C, so nowhere near yesterday's 40.3C in Lincolnshire. The thing about 1976 is that it was extremely dry, with not a drop of rain falling in many places between the Saturday of the Lord's Test in mid-June until August Bank Holiday. That after a very dry winter and spring and, almost forgotten because of 76, the long hot summer of 1975! It helped that once the weather broke in '76 it rained almost constantly for two months but the prospect of drought remains a problem on top of silly temperatures like yesterdays.
I should add that in Scotland yesterday it was a bearable 32C and just the kind of hot summer day I remember from 1976. It was still freakish for Scotland though.