Thanks Guys.
All good Advice
reference the RJW suggestion of Yokohama BluEarth ES32 195/65/R15. Using Profile 65 instead of 60. Excuse my ignorance but if it increases ride height does it impact speedo readings. Anu other unintended consequences of going for 65s
Only about 3.2% which is 1mph at 30mph, so no worries really.
Unless you are driving in Suffolk or Norfolk where they allow no margin for error

As I understand it, generally the allowance over the applicable speed limit is +10%+2mph. So if you exceed 35mph in a 30 limit you are most likely to get done. (if caught)
However, the police can use their discretion to collar you for less than that so in East Anglia maybe and anywhere else come to that,, they would be within their rights to get you for 31mph in a 30 limit, so an over reading speedo is advisable to some degree.