Adding numbers in a cell

[JaSonic75]

Good Morning,

Trying to get a formula right from the attached spreadsheet.

In column E I'm trying to get an automated formula from columns B,C,D

The result I'm trying to get is:
Initials from B, D+D, M+M from C, H+H M+M from D # Number of times name mentioned up until that row
EG:
In row 4
Intiials from B = TI, D+D=8 M+M=1 from C, H+H=4, M+M=14(then again to round down to single digit=5) from D,#01
Resulting in E4 being TI8145#01

I've tried many formulas i've found on Google, but none of these add up to the correct numbers?
I'm not sure if because they are in date and time formats, the : and / may be affecting the formulas?

Any help much appreciated.

Many thanks in advance.