There were several BAe designs, not just the P110. There were the P96, P106, ECA and ECF. The ACA and EAP drew from them all.It included the MBB design base, that's why the ACA was so different from the P110 and later eveloved into the EAP, but the Base design remains of MBBs initial concepts.
The TKF design has a cranked delta and two fins. The EF uses the single tail plane from the P96 and P106 and the pure delta from P110 and the underneath intakes from the ECF.
A mock-up also doesn't make an aircraft. The manufacturing processes, engines and systems were all UK.