Thanks to Ian G6TGO and Joe EI3IX (IRTS VHF Manager) for this information.
The EI 4 metre allocation is 70.125 - 70.450.
Only fixed or portable operation is allowed, not mobile.
This is the application form for an experimental permit to operate on 4m (or 6m).
There is a 4 metre activity night in EI-land on the first Tuesday of each month. The time varies between 20.00hrs - 22.00hrs, however most activity seems to come up on air around 21.30hrs. Needless to say, some months are more active than others, since some stations have to go up to high ground to operate portable on this band.
The main centres of activity are: Tipperary (South central EI), Cork in the South, Dublin/Louth on the East coast and Mayo on the west coast. The main activity is on FM, but some have access to SSB/CW/AM. Polarization is mainly vertical, but horizontal is also used.
Most of the gear used is ex-PMR: the Simoco FM1000 is a very popular model; some use the AKD4001, and the odd one uses the FT847. 70.2625 is used as the calling channel (as opposed to 70.260), since most operators have the channelised PMR rigs with 12.5kHz channel spacing.
There is also a 4 metre "simplexer" unit on 70.350FM, based in the Tipperary/Cork region, which is usually active during the activity evenings.