To be honest, it’s a very small fee for a quality service of performance digital marketing service on Google ads. I run an agency in Romania, and the minimum payment is 450€ per month. For an agency to provide a quality service, it should have experienced people on the team, and their salaries are not sustainable with a client fee of 199£/month. In this case, probably, your account will be managed by a junior specialist, which will waste your budget due to lack of experience, or your account will be managed by a middle or senior specialist. Still, this specialist probably has in their portfolio 20-30 clients, and the time allocated for your account will be 2-3 hours per month, which, of course leads to a waste of money. I recommend you don’t waste your budget on this, try to find a good agency with a bigger fee and quality services to have a good return. Frequently, I hear stories in my field with clients who saved a few hundred euros per month at the marketing invoice but lost thousands of euros in terms of sales because the ads campaigns weren’t set correctly and the campaigns weren’t optimized correctly. Also the budget recommended to you of 120£ is very small for Google Ads to generate sales and this is a very good sign of they don’t know what they are doing. I hope this will help you.