Considering my OH's oncologist can't see any of his GP records, including blood tests, etc., I doubt it.
Even when OH went to see a different specialist oncologist in a different hospital, the specialist one had no access to the first oncologists records, nor x-rays, scans, etc., and had to order the whole suite of tests to be done again as he said it was "easier" just to re-do them all than get the records sent from the first hospital!
Same with his orthopoedic surgeon - no access to oncology nor GP records, so had to start with a clean sheet, do full medical history, repeat x-rays etc.
Even when he's asked the nurses during his chemo infusions, they've said they had no access to test results.
His GP always denies being able to access anything at all from any of the hospitals/consultants he's been to and always has to wait for "letters" from them before they can re-refer elsewhere or issue a prescription, etc., which can take a couple of weeks and often needs chasing up.
We see no sign at all of any form of "joined up" system between different fragmented areas of the NHS in practice.