Hi Matt, two questions,
Where are you located in the country?
Where do you plan to activate?
I ask this as if you're planning to activate around NE Wales and the NW of England you could probably get away with an omni directional antenna. If like me, you go to Mid Wales and South Wales alot, then you need directional antennas.
I activated Moel Gyw (NE Wales) once and had 7 randomly generated QSOs from calling CQ all into Greater Manchester and NE Wales.
If I am in range of the Black Country then I know there are 3 FM 23cm users there.
If I am in range of Cheltenham then you have about 5-6 FM users there.
I mainly use a small 11 ele beam made by sandpiper, but the quadruple quad that Gerald mentioned is pretty good and lightweight. I also have the PCB antenna, do not rate it if i am honest, the wheel is not much better.
If you're ever in the Welsh Borders, I can fire 8-10 watts at you with either a horizontal beam or a vertical beam. I have no permanent antennas up for the band, but can be QRV within about 3 minutes and can change the polarity very quickly. I have LOS to G/WB 002, 3, 4, 5, 6, 7, 12, 14, 15, 18, 23 and GW/MW-002, 9 and 13.
Surely the below photos show the crudest set up for 23cm ever! An 11 element attached to the handle of a glass lifting sucker. The word "Amateur" certainly comes to mind - normally fed with westflex 103 (the thin coax was for testing purposes, RG 223 I think?). The house windows are facing North (front of house) and South (rear of house), so by opening and shutting the window through 90°, I can beam a full 180° (depending on which window I attach it to - No wonder the Neighbours think I am odd!
Matt, I wish you all the best and hope to have a QSO with you soon.
73 Matt G8XYJ