Thanks for reply. OK, Any preference on brand (Crucial, Corsair Vengeance, Kingston Hyper X) or are they all similar?
https://www.amazon.co.uk/dp/B019FRCV9G/ref=twister_B08KHKLP8B?_encoding=UTF8&th=1
https://www.amazon.co.uk/dp/B01BNJL8I4/ref=twister_B07S4X6Y6H?_encoding=UTF8&th=1
https://www.amazon.co.uk/Corsair-CMSX32GX4M2A2666C18-Vengeance-SODIMM-Laptop/dp/B01BGZEVHU/ref=sr_1_8?dchild=1&keywords=laptop%2Bram&qid=1603929582&sr=8-8&th=1