Moving to a rigid board will ease your sufing progress a lot.
The whooper are nice boards, but designed more for heavier riders.
On the flat, anything paddles OK, as long as you keep enough length. Your choice should more be done on the surfing side. 10' should be a good compromise on the length, the length will make catching small fickle waves easier.
Basically you must chose between a longboard shape (round nose) that is stabler and allows noseriding, and a semi-pointed nose that does plough less in chop, and allows turning without going as far back to the tail.
In the Gong line that I know best and recommend(*), it means:
Longboard: The NFA 10'
https://gongsupshop.com/epages/box1707.sf/en_GB/?ViewObjectPath=%2FShops%2Fbox1707%2FProducts%2FGON8SUPNFA10WPointed nose: the Cloud 9'10"
gongsupshop.com/epages/box1707.sf/en_GB/?ObjectPath=/Shops/box1707/Products/GON8SUPCLOUD910W(you can try to buy them on the shop and stop before paying to get the amount of deliveree fees for your exact place in the UK, but it should be 70? for the mainland UK)
If you have no preference, I would advise the NFA. You are not too heavy, so you do not need too much volume (140 l will be plenty enough), yeat get enough stability from the planshape and paddling speed from the length, and the pulled-in tail will help turning without having to move back a lot.
I would advise you to read the descriptions of the Gong boards on the site. They accurately portray the behavior of each board, so that you can compare the models between them. This will help you even for buying models in other brands, to get a feeling of the differences between the various type of boards. (Comparing descriptions between different brands of course is not very useful)
(*) Disclaimer: I am a Gong ambassador. I discuss these specific models as I know them best and can recommend them heartily, but boards in other brands may also be very good choices: Jimmy Lewis, Naish, Starboard, F-One, JP, Fanatic, Lakahi, Nah Skwell, NSP,.... all the ones on the market fro some years. For instance, in the JP line, I would recommend the "longboard" model over the "fusion", it will be much easier to learn surfing on, and more adapted to small waves. The widebody would be nice also, but like the wooper, more geared to heavier riders, it will be a bit cumbersome and slow for you. The 10'x29" may be a tad unstable for a beginner in chop (due to the width), the 10'6"x30" would be a safer choice, etc...
