GB blocks of stamps are usually collected as below and normally have the control and cylinder numbers as well...

Your blocks of stamps, although big, would not display easily and with no control or cylinder numbers to identify would not be all that valuable as a part sheet.
The above cylinder block of stamps would be easily bought for around £3 so I would estimate the value of your stamps to be roughly one quarter of that if divided into blocks of four or six. It is possible that someone might want larger blocks or even the whole thing but, as I said, it would not display easily and the lack of identity would not make it worthwhile.