Earlier quoted context omitted.
Would you be willing to copy paste (redacted if needed) exactly what the "Intellectual Property Rights" section of your contract states right now? I would like to have it on hand to use as a "this is what others have and I want the same", concrete example.
Not OP, but here's the exact words from the contract: >You will give the Company full written details of all Inventions and of all works embodying Intellectual Property Rights made wholly or partially by You at any time during the course of Your Employment (whether or not during working hours or using Company premises or resources) which relate to, or are reasonably capable of being used in, the business of the Compa…
"which relate to, or are reasonably capable of being used in, the business of the Company or any Group Company" sounds like a good phrasing to me, especially the "business" part of it as I interpret it to be the company simply wanting you to not build a competing product while employed there (a fair thing to have in a contract).
For reference, this is what my last contract had: https://news.ycombinator.com/item?id=24220800 (notably 13.4 (c))
How I see it, "whether or not during working hours or using Company premises or resources" is not problematic here as "or otherwise" was in my block of text since this only refers to the employer's "business" related IP, and not "everything" you create (if your personal work is a stock trading library and your employer sells a booking for dog haircuts SAAS, these won't collide).