Is their anything else anyone would suggest?
Yeah if the game isnt ridiculously splashy and the guy isn't just going to be going nuts here much then the call isn't great (some people can literally just have boats here, some crazy games you might get people jamming their Tx here. V.unlikely though).
and is the £4 on the river way to thin a value bet?
No it's not very thin, i'd happily be betting for value with a bunch of Tx hands, flushes and boats. Seems like the pot is about £4 at this point, so i'd bet less than you did, maybe £2.50 or £3. It's unlikely he'll raise anything worse, but can call with loads of worse hands.