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It could be any number of things from the sparse information you have given. The only way to know is to have it diagnosed with a code reader and maybe some measurements of such things as injector flow rate and compression.

@Kev-P thanks for your reply. No I haven’t do I need the head lining off to do that? Thanks @spartacus 68 I had a very long look under the bonnet couple of days ago. I removed the cover near the windscreen- removed as many of the leaves and soil I could reach. Spent a long time trying to find the drains under there with a torch but couldn’t. I went round all the doors and removed the bottom rubber seal - this is intact, the drain holes were clear and no water came out or heard. I took the spare wheel out of the boot - it’s all dry in there, no sign of water or condensation. The same with both rear wheel arches - completely dry. I watched a video or 2 and they said about removing the cover between the bases of the windscreen to access the area below this after removing the windscreen wipers. As I struggled so much with the engine cover, getting it back into place, I didn’t want to remove this lower windscreen cover - for fear of not being able to put it back together! so I have removed a couple of water ingress points - rear of the car but now stuck moving forward as basically too weak!! Thanks for your help

VCDS is a high quality scanner that plugs in to the OBD port of the car. It is connected to a computer for scanning of fault codes and diagnoses. There are a few other decent code readers available which are usually used by professionals. There are many cheaper code readers available that are aimed at domestic users, but they generally don't have the discrimination of better units which means they mislead users with wrong codes. I recommend you either buy a good quality equivalent or get the car diagnosed professionally. Don't waste your money on cheap readers.