T Rex Electric Warrior February 1972, I was 11 and it was half term. So 46 years ago this week probably !
Purchased from Curry's, High Street, Cheltenham (domestic appliances ground floor, records galore upstairs.) I think it cost about £2.75, the chap who served me asked me if I had a paper round or something to enable me to afford it, I said no, I had just saved up.
I do wish I had kept that record, certainly one of my desert island discs.
I then had a 3 year break from buying records for some reason, so the next one was Sheer Heart Attack by Queen in February 1975. Still got that one though, along with Queen 1 & 2 bought soon after.