Here are a few sketches done in Oxford when I was there between 1970 and 1973. The first three are in pen and ink wash. Eventually I got some watercolours and a little hand-held palate (for my 21st birthday, I think)….. after that I used those, as in the bottom two sketches (these were done looking out of high windows of libraries where I was supposedly studying).

Back of Norham Gardens from the Parks 
Catte Street 
Sheldonian Theatre and Broad Street 
Across the rooftops at sunset 
Radcliffe Camera