Once I had managed to remember the tyre details for the Insignia's tyres I had a search online for local fitters and get some prices.
Tyres now come with a scale from A to F for their efficiency in two fields, fuel consumption and wet grip. Ideally you will look for AA rated but once you see the prices then you start to go through the list to find the best rated at a price you can afford.
In the end I opted for these CA rated Uniroyals. Most of the online places had them but Asda came out the cheapest with an all-in price, and have a local fitter. The most local fitters are only open weekdays and so I had to pick the second nearest.. A garage that although I have used for petrol on many occasions, I had no idea they did tyres. We'll find out tomorrow morning.
One of the tyres is the original from when I bought the car in January 2014 and at the last MoT it was noted that it would need replacing although legal. I've done about 25000 miles in that time (below average mileage for UK) and it was obviously not brand new then.
The left front is newer. The original was destroyed in the accident of May 2015 when it came in contact with the kerb. They replaced it as part of the repair job to the entire right side of the car wiped out by KFC munching van driver. I've not been entirely pleased with it as it constantly needs the air topping up..
Having new valves might sort that out but in truth I have become less and less confident in them as they wear down. I have never heard of the make either!