4G of theoretical speeds^ up to ~412mbps is available in a significant number of cities and large towns.
The Pink '4G+' layer on EE's coverage map shows coverage where the theoretically attainable speed^ is 300mbps or above*.
^In optimal signal conditions and without concurrent utilisation.
*Broadly the '4G+' map layer is demonstrating Band 7 coverage, where Band 3 exists below. With 64QAM and 2x2 MIMO, 40MHz paired spectrum leads to a ~300mbps theoretical download speed. Further Band 7 spectrum, higher order MIMO and increased modulation level can increase this to near gigabit speeds.