OK I'm definitely going fishing tomorrow. It's a gently sloping sandy beach on the French side of the channel. Can't get to a bait shop cos they are all miles away so I was thinking of using bits of mackerel as bait. Would that work? Any other advice re setup gratefully received. I've got a beachcaster rod with a multiplier reel.
Sounds like you should be rocking the bass there. If you can, check out the beach at a low tide and try and look for spots where there are channels where the water will be slightly deeper as the tide comes in; this is where you should be aiming to put your bait. Have a looksee around at low tide for what sea creatures are around on the beach as well, because this is what the fish will be picking up when they are coming up the beach as the tide comes in. Mackeral is ace bait, just try and make sure it's fresh and firm, or it will come off your hook really quickly. Use a piece with the skin on, as the skin will hold the bait firmly on the hook. Just about everything in the sea eats mackeral, but I have always found it better to use bait from the local area, on a sandy shore this would be ragworn or lugworm. When I have fished areas like this, a simple rig is as follows: have a good couple of rod lengths of heavy duty shock leader on the end of your line (you can get by without this, but it is better to have it as it'll really p**s you off when your line catches the rings and you watch weight and all catapult out to sea no longer attached to your line). I used to have around 20ft of 50lb shock lead on my 12ft beach caster, the remainder of my line would be 15 to 20lb test. Have a 4oz weight on the end of the line. Around about a ft up the line from the weight, attach a length of line just under a foot long; on the end of this hitch a #2 or #3 hook. Whack the mackeral on the hook.
I would start fishing at low tide, just before the tide starts to come in. Lob the bait out as far as you can, and then reel in a bit until the line is tight and you can see and feel the tip of the rod go when a fish hits. Check your line every 15 to 20 mins, as crabs will rob the bait and if it's not super fresh the wave action may dislodge it, and re-bait as necessary. Keep lobbing it out as the tide comes in, and see what happens, try to target the areas with the channels if you can, because these are the areas where fish will have an extra few inches of water over their heads as they come up the beach with the tide, hoovering up whatever they can find.
I've found this to be good for bass, haddock, cod, pollack, dogfish and whiting. I even caught a silver eel once. On sandy beaches you'll also get flounder and plaice coming in, but I've never had one take mackeral, I've only caught them on worm. In areas with a bit of rock and deeper water, this method is also good for wrasse and (where the water gets real deep) conger eel.
Best of luck sir; there are no guarantees in the fishing world.
Let me know how you get on.
Pete